{"title":"Optolong Master Collection","description":"","products":[{"product_id":"optolong-l-enhance-dual-bandpass-filter-h-alpha-o2-2-inch","title":"Optolong L-eNhance Dual Narrowband Filter (H-Alpha and H-Beta\/O-III)","description":"\u003cp\u003eThe relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and frequently include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.\u003c\/p\u003e\n\u003cp\u003eL-eNhance provides an economical and practical solution for amateurs. It is a dual band-pass narrowband filter which has been designed for DSLR (digital DSLR), color CMOS and CCD Astrophotography Cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. This filter is excellent for imaging object which emit H-alpha and O-III\/H-beta light with near-complete rejection of all other light.  For more broadband targets such as galaxies and reflection nebulae, the Optolong L-Pro is the best-suited Optolong filter.\u003cbr\u003e\u003cbr\u003eOptolong believes the design of the L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha (10nm band width), H-Beta, and Oxygen III (24nm band width) nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.  This filter is excellent for emission targets such as nebulae which emit in H-Alpha and Beta, and O-III.  For more broadband targets such as galaxies or reflection nebulae, the \u003ca href=\"https:\/\/telescopescanada.ca\/products\/optolong-l-pro-light-pollution-filter?_pos=1\u0026amp;_sid=92b15e7ad\u0026amp;_ss=r\u0026amp;variant=28434278711376\"\u003eL-Pro\u003c\/a\u003e is excellent.  For maximum light pollution rejection with 7nm bands at H-Alpha and O-III, try the \u003ca href=\"https:\/\/telescopescanada.ca\/collections\/optolong\/products\/copy-of-optolong-l-enhance-dual-narrowband-filter-h-alpha-and-h-beta-o-iii?_pos=1\u0026amp;_sid=af2b2b39a\u0026amp;_ss=r\u0026amp;variant=32334135001168\"\u003eL-Extreme filter\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cstrong\u003eNote\u003c\/strong\u003e: The Optolong L-eNhance filters (apart from the threaded both sides version) have threads on one side to keep them very thin - 1.85mm not including the threads - they can be used with \u003ca style=\"color: #2b00ff;\" href=\"https:\/\/telescopescanada.ca\/collections\/filter-wheels\"\u003eFilter Wheels\u003c\/a\u003e, \u003ca style=\"color: #2b00ff;\" href=\"https:\/\/telescopescanada.ca\/products\/2-telescope-filter-drawer-system-with-2-drawers?variant=29091833315408\"\u003eFilter Drawer System\u003c\/a\u003e, focusers with a place to thread focal reducers internally (such as some Moonlite focusers) and camera nose pieces that fit into compression rings, but the 1.85mm filter should not be threaded into the imaging train like an adapter ring with threads on both sides.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #2b00ff;\"\u003eThe threaded both sides version however can be used like an adapter ring and can be threaded directly into your optical train without any additional equipment required. The threaded both sides version has a thickness of 7.6mm not including the threads.  \u003cstrong\u003eNote that this size filter will NOT fit in most filter wheels or drawers.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eL-eNhance Filter Spectrum Curve\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003eAccording to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/L-eNhance_Filter_curve_480x480.png?v=1588173898\"\u003e\u003c\/p\u003e\n\u003ch4\u003eCanon EOS-C Supported Models:\u003c\/h4\u003e\n\u003cp\u003e7D2\/80D\/800D\/77D\/70D\/760D\/750D\/700D 650D\/600D\/550D\/500D\/400D\/100D\/1100D 1200D\/1300D\u003c\/p\u003e\n\u003cp\u003eThe filters work with all EF lenses, but is not suitable for Canon EF-S lenses.\u003c\/p\u003e\n\u003cp\u003eMore details from Optolong can be found \u003ca href=\"https:\/\/www.optolongastronomy.com\/cms\/document\/detail\/id\/112.html\"\u003eHere\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate:\u003c\/td\u003e\n\u003ctd\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness:\u003c\/td\u003e\n\u003ctd\u003e1.85mm \/ 10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTpeak:\u003c\/td\u003e\n\u003ctd\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking range:\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking depth:\u003c\/td\u003e\n\u003ctd\u003elight pollution  line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality:\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eλ\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eParallelism (arc sec):\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate:\u003c\/td\u003e\n\u003ctd\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness:\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTpeak:\u003c\/td\u003e\n\u003ctd\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking range:\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking depth:\u003c\/td\u003e\n\u003ctd\u003elight pollution  line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality:\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eλ\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eParallelism (arc sec):\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":28314437779536,"sku":"Optolong L-eNhance-1.25INCH","price":254.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":28314423853136,"sku":"Optolong L-eNhance-2INCH","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" THREADED BOTH SIDES (7.7mm CASING)","offer_id":31647187304528,"sku":"Optolong L-eNhance-1.25INCH6mm Dual Threaded","price":254.0,"currency_code":"CAD","in_stock":true},{"title":"2\" THREADED BOTH SIDES (7.7mm CASING)","offer_id":29034783146064,"sku":"Optolong L-eNhance-2INCH6mm Dual Threaded","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C - Please See Description for Supported Models","offer_id":32289129234512,"sku":"Optolong L-eNhance-EOS-C","price":368.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-2-optolong-l-enhance-dual-narrowband-filter-h-alpha-and-h-beta-o-iii-11565594116176.jpg?v=1668534817"},{"product_id":"optolong-l-pro-light-pollution-filter","title":"Optolong L-Pro Light Pollution Filter","description":"\u003cp\u003eOptolong L-Pro (L-Professional) is a multi-band-pass filter which selectively suppresses the transmission of light pollution lines. For example, mercury vapor lamps, high and low pressure sodium vapor lights and sky glow caused by emission from neutral oxygen in our atmosphere.  The L-Pro works well for galaxies, reflection and emission nebulae and all other emission or reflection targets in combination with strong light pollution rejection.  This filter is Optolong's strongest light pollution filter that isn't a narrowband filter (such as the \u003ca href=\"https:\/\/telescopescanada.ca\/products\/optolong-l-enhance-dual-band-pass-filter-h-alpha-o2-2-inch?_pos=2\u0026amp;_sid=92b15e7ad\u0026amp;_ss=r\u0026amp;variant=28314423853136\"\u003eL-eNhance\u003c\/a\u003e or \u003ca href=\"https:\/\/telescopescanada.ca\/collections\/optolong\/products\/copy-of-optolong-l-enhance-dual-narrowband-filter-h-alpha-and-h-beta-o-iii?_pos=1\u0026amp;_sid=af2b2b39a\u0026amp;_ss=r\u0026amp;variant=32334135001168\"\u003eL-eXtreme\u003c\/a\u003e).\u003cbr\u003e\u003cbr\u003eL-Pro enhances the transmission of major emissions from nebula while offering great color balance with its wide yet effective light pollution cutting transmission band. The balanced transmission allows objects with wide emission spectrum such as galaxies to be imaged with minimal color cast (easier to correct in post-processing). Among the emission lines enhanced are OIII (496, 500nm), H-beta (486nm), NII (654, 658nm), H-alpha (656nm) and SII (672nm).  Available in 2\", 1.25\" and selected DSLR camera sizes.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cstrong\u003eNote\u003c\/strong\u003e: The Optolong L-Pro filters (apart from the threaded both sides version) have threads on one side to keep them very thin - 1.85mm not including the threads - they can be used with \u003ca style=\"color: #2b00ff;\" href=\"https:\/\/telescopescanada.ca\/collections\/filter-wheels\"\u003eFilter Wheels\u003c\/a\u003e, \u003ca style=\"color: #2b00ff;\" href=\"https:\/\/telescopescanada.ca\/products\/2-telescope-filter-drawer-system-with-2-drawers?variant=29091833315408\"\u003eFilter Drawer System\u003c\/a\u003e, focusers with a place to thread focal reducers internally (such as some Moonlite focusers) and camera nose pieces that fit into compression rings, but the 1.85mm filter should not be threaded into the imaging train like an adapter ring with threads on both sides. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #2b00ff;\"\u003eThe threaded both sides version however can be used like an adapter ring and can be threaded directly into your optical train without any additional equipment required. The threaded both sides version has a thickness of 7.6mm not including the threads.  \u003cstrong\u003eNote that this size filter will NOT fit in most filter wheels or drawers.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cp\u003e90% transmission at major nebula emission lines\u003cbr\u003eMulti-layers anti-reflection coating\u003cbr\u003ePrecise and sharp roll-off at light pollutant lines\u003cbr\u003e2 mm filter thickness (1.25\", 2\") | 1mm (clip series)\u003cbr\u003eMade on Schott substrate\u003cbr\u003eFinely polished to 1\/4 wave accuracy\u003cbr\u003eSurface quality: 60\/40 (MIL-O-13830 standard)\u003c\/p\u003e\n\u003ch4\u003eBest Uses\u003c\/h4\u003e\n\u003cp\u003eMonochrome \u0026amp; one-shot-color CCD\/CMOS camera\u003cbr\u003eDeep sky color imaging, particularly reflective nebula and galaxies\u003c\/p\u003e\n\u003cp\u003eCanon EOS FF Available for: EOS 5D\/5DmarkII\/III and 6D only\u003cbr\u003e\u003cbr\u003eNikon FF Available for: D600\/D610\/D700\/D750\/D800\/D800E\/D810\/D810A\/DF\u003cbr\u003e\u003cbr\u003eSony FF Available for: A7M\/A7M2\/A7M3\/A7R\/A7R2\/A7R3\/A7S\/A7S2\/A9.  Works with the Mark I series Sony cameras (a7, a7r, a7s).  \u003cstrong\u003eMay not fit into newer generation Sony cameras.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cp\u003eTpeak: T\u0026gt;90%\u003cbr\u003eSpectrum: 380-750nm\u003cbr\u003eOptical Density:  Light pollution emission is blocked 90%\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism (arc sec): 30s\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":28434278776912,"sku":"OPTOLONG-LPRO-1.25INCH","price":212.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":28434278711376,"sku":"OPTOLONG-LPRO-2INCH","price":283.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" THREADED BOTH SIDES (7.7mm CASING)","offer_id":31647208833104,"sku":"Optolong L-PRO 1.25 INCH 2-SIDED THREADS (10mm)","price":212.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C","offer_id":28434411716688,"sku":"OPTOLONG-LPRO-EOS-C","price":354.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-FF","offer_id":29175211393104,"sku":"OPTOLONG-CANON-EOS-FF","price":382.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS R","offer_id":40545762050230,"sku":"OPTOLONG-CANON-EOS-R","price":354.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon FF","offer_id":30271181357136,"sku":"Optolong L-Pro Nikon-FF","price":382.0,"currency_code":"CAD","in_stock":true},{"title":"Sony FF","offer_id":30271173361744,"sku":"Optolong L-Pro Sony-FF","price":382.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon Z","offer_id":46512478060763,"sku":"Optolong L-Pro Nikon-Z","price":354.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-2-optolong-l-pro-light-pollution-filter-11187337592912.jpg?v=1750624192"},{"product_id":"optolong-uhc-ultra-high-contrast-light-pollution-filter","title":"Optolong UHC Ultra-High Contrast Light Pollution Filter","description":"\u003cp\u003e\u003cspan\u003eThe UHC (Ultra-High Contrast) broadband filter is designed to improve the visibility of various deep-sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting such as mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (sky glow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe filter is highly transparent in the main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm). The filter is suitable for enhancing the contrast and details for both visual and photographic purpose in\u003c\/span\u003e\u003cspan\u003e suburban and rural areas with heavy light pollution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for color CCD cameras and unmodified DSLRs that accept 1.25\" filters.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e With narrower band-pass transmission gaps, this filter provides higher contrast than CLS filters.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e The UHC filter has a substantial red band-pass and offers superb views of objects like the Orion Nebula (M42)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Light pollution filters do not eliminate the effects of light pollution or increase the object's brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eCanon EOS FF Available for: EOS 5D\/5DmarkII\/III and 6D only\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eNikon FF Available for: D600\/D610\/D700\/D750\/D800\/D800E\/D810\/D810A\/DF\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eSony FF Available for: A7M\/A7M2\/A7M3\/A7R\/A7R2\/A7R3\/A7S\/A7S2\/A9\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSchott substrate material\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Thickness 2.0 mm (1.25\"\/2\"\/36mm)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Thickness 1.0 mm (Clip series)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Surface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Fine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e 95% transmission of main nebula emission lines (i.e. H-alpha 656nm, OIII 496nm and 500nm, SII 672nm and H-beta 486nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). Transmission of 0.1% is equivalent to OD3 (Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Parameter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMulti-layers anti-reflection coating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation from temperature change\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eUltra-thin filter cell minimizes vignetting by maximizing the clear aperture (clear aperture is 26mm for 1.25\")\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Airplane Grade Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003ePlastic PP Case | Imported High Pressure EVA Case Lining | Silver Cardboard Box | High Density Sponge Carton Lining\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eStandard 1.25\"\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThe Major Emission Lines of Nebulae\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eH-β486.1nm OIII 495.9nm OIII 500.7nm H-α656.3nm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThe Major Emission Lines of Artificial Light Pollution\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHg 435.8nm 546.1nm 577nm 578.1nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNa 598nm 589.6nm 615.4nm 616.1nm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":28463274066000,"sku":"OPTOLONG-UHC-1.25","price":78.0,"currency_code":"CAD","in_stock":false},{"title":"2\"","offer_id":29003532730448,"sku":"OPTOLONG-UHC-2","price":121.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C","offer_id":30271546654800,"sku":"Optolong-UHC Canon-EOS-C","price":69.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-FF","offer_id":30271526731856,"sku":"Optolong-UHC Canon-FF","price":163.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon-FF","offer_id":30271219695696,"sku":"OPTOLONG-UHC Nikon-FF","price":163.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-1-25-optolong-uhc-ultra-high-contrast-light-pollution-filter-11187396345936.jpg?v=1668533740"},{"product_id":"optolong-lrgb-1-25-filter-set","title":"Optolong LRGB Filter Set","description":"\u003cp\u003e\u003cspan\u003eThe Optolong LRGB filter set is designed for maximum contrast and with extremely high gradients for clear differentiation of colors. The filters divide the spectrum into red, green, blue and luminance. \u003c\/span\u003e\u003cspan\u003eOIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. The gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves color balance and separation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFine-optically polishing for double-sides ensures accurate λ\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUltrasonic wave cleaning substrate with purified water removes impurities and dust effectively\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIRO source assisted coating for durability and resistance to scratching, as well as stability on CWL (central wavelength). No deviation from temperature change.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConstant stringent quality testing processes - Each filter is tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure each filter is a high-quality product\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptolong will spare no effort to serve our customer with outstanding quality products and best service!\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e31mm and 36mm filters are unmounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eTavg: T\u0026gt;95%\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCoating Wavelength: 300-1050nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptical Density: OD3\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eSurface Quality: 60\/40\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eParallelism (arc sec): 30s\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eFilter Casing Width: 4.9mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":39452237463734,"sku":"OptolongLRGB-1.25\"","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":39452237496502,"sku":"OptolongLRGB-31mm","price":354.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":39452237529270,"sku":"OptolongLRGB-36mm","price":382.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":39452237562038,"sku":"OptolongLRGB-2\"","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-1-25-optolong-lrgb-filter-set-11848068530256.jpg?v=1668533918"},{"product_id":"optolong-1-25-s-ii-h-alpha-o-iii-unmounted-3-piece-filter-set","title":"Optolong 7nm\/6.5nm SHO S-II\/H-Alpha\/O-III 3 Piece Filter Set","description":"\u003cp\u003e\u003cspan\u003eThe Optolong SHO narrowband filter set is designed for use with astronomical monochrome CCD, CMOS and DSLR cameras. These filters set are commonly used by astrophotographers to present their photos in Hubble Palette. This filter set includes H-Alpha 7nm, SII 6.5nm and OIII 6.5nm, covering the emission lines of 656.3nm, 671.6nma and 500.7nm respectively.  The filters provide high transmittance in order to obtain the maximum contrast of nebulae while cutting out background emission and suppressing bright starlight.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFine-optically polishing for double-sides-- Ensure accurate λ\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUltrasonic wave cleaning substrate with purified water to remove impurities and dust effectively\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIRO source assisted coating - For durability and resistance to scratching, as well as stability on CWL (central wavelength).  No deviation from temperature change.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConstant stringent quality testing processes - Each filter is tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptolong will spare no effort to serve our customer with outstanding quality products and best service!\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!--30--\u003e\n\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCWL(center of wavelength): H-Alpha 656.3nm\/SII 671.6nm\/OIII 500.7nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFWHM: H-Alpha7nm\/SII 6.5nm\/OIII6.5nm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTpeak: \u0026lt;85%\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptical Density: OD 3\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSurface Quality: 60\/40\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eParallelism(arc sec): 30s\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eFilter Casing Width: 4.9mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":39452183068854,"sku":"Optolong-SHO-1.25\"","price":694.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Unmounted","offer_id":39452183101622,"sku":"Optolong-SHO-Unmounted-31MM","price":677.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":39452186378422,"sku":"Optolong-SHO-Unmounted-36MM","price":780.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":39452186869942,"sku":"Optolong-SHO-2\"","price":950.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-1-25-optolong-7nm-6-5nm-sho-s-ii-h-alpha-o-iii-3-piece-filter-set-13080960860240.jpg?v=1668535177"},{"product_id":"optolong-1-25-lrgb-h-alpha-7nm-sii-6-5nm-and-oiii-6-5nm-7-piece-filter-set","title":"Optolong LRGBSHO 7nm 7 Piece Filter Set","description":"\u003cp\u003e\u003cspan\u003eThe LRGB filter set is designed for maximum contrast, with extremely high gradients for clear differentiation of colors. This filter set divides the spectrum into its component colors - red, green, blue, plus luminance. The \u003c\/span\u003e\u003cspan\u003eOIII emission line overlaps blue and green filters, with maximum transmission to allow for high efficiency and natural color imaging. The gap between the green and red filters serves to block out the primary sodium light pollution line at 589nm and improves color balance and separation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe included SHO filter set is generally used with astronomical monochrome CCDs and DSLRs. These types of filters are commonly used by astrophotographers to present their photos in the Hubble palette. This filter set includes narrowband filters for H-Alpha 7nm, SII 6.5nm and OIII 6.5nm, which cover the emission lines 656.3nm, 671.6nm and 500.7nm. The filters provide high light transmittance so as to obtain the maximum contrast with nebulae while cutting out background emissions and suppressing starlight and light pollution\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e31mm and 36mm filters are unmounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ch4\u003eLRGB Specifications \u003c\/h4\u003e\nTavg: T\u0026gt;95%\u003cbr\u003eCoating Wavelength: 300-1050nm\u003cbr\u003eOptical Density: OD3\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism (arc sec): 30s\u003cbr\u003e\u003cspan\u003eFilter Casing Width: 4.9mm\u003c\/span\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch4\u003eSHO Specifications\u003c\/h4\u003e\nCWL (center of wavelength): H-Alpha 656.3nm, SII 671.6nm, OIII 500.7nm\u003cbr\u003eFWHM: H-Alpha7nm, SII 6.5nm, OIII6.5nm\u003cbr\u003eTpeak: \u0026lt;85%\u003cbr\u003eOptical Density: OD 3\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism(arc sec): 30s \u003cbr\u003eFilter Casing Width: 4.9mm\u003cbr\u003e\n\u003cp\u003e\u003cbr\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":39452251291830,"sku":"OPTOLONG-LRGBSHO-1.25\"-1","price":944.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":39452251324598,"sku":"OPTOLONG-LRGBSHO-31mm","price":1001.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":39452251357366,"sku":"OPTOLONG-LRGBSHO-36mm","price":1101.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":39452251390134,"sku":"OPTOLONG-LRGBSHO-2\"","price":1433.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-1-25-optolong-lrgbsho-7nm-7-piece-filter-set-12759344873552.jpg?v=1668534287"},{"product_id":"optolong-1-25-lrgb-h-alpha-7nm-5-piece-filter-set","title":"Optolong LRGB + H-Alpha 7nm 5 Piece Filter Set","description":"\u003cp\u003e\u003cspan\u003eThe LRGB filter set is designed for maximum contrast, with extremely high gradients for clear differentiation of colors. This filter set divides the spectrum into its component colors - red, green, blue, plus luminance. The \u003c\/span\u003e\u003cspan\u003eOIII emission line overlaps blue and green filters, with maximum transmission to allow for high efficiency and natural color imaging. The gap between the green and red filters serves to block out the primary sodium light pollution line at 589nm and improves color balance and separation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe included H-Alpha filter set is generally used with astronomical monochrome CCDs and DSLRs. These types of filters are commonly used by astrophotographers to image fine nebulosity while cutting down on bright starlight, and can replace the red filter or luminance filter while performing narrowband imaging. The H-Alpha 7nm filter is centered on 656.3nm. It provides high light transmittance so as to obtain the maximum contrast with nebulae while cutting out background emissions and suppressing starlight and light pollution\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e31mm and 36mm filters are unmounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ch4\u003eLRGB Specifications \u003c\/h4\u003e\nTavg: T\u0026gt;95%\u003cbr\u003eCoating Wavelength: 300-1050nm\u003cbr\u003eOptical Density: OD3\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism (arc sec): 30s\u003cbr\u003e \u003cspan\u003eFilter Casing Width: 4.9mm\u003c\/span\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch4\u003eSHO Specifications\u003c\/h4\u003e\nCWL (center of wavelength): H-Alpha 656.3nm\u003cbr\u003eFWHM: H-Alpha7nm\u003cbr\u003eTpeak: \u0026lt;85%\u003cbr\u003eOptical Density: OD 3\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism(arc sec): 30s\u003cbr\u003eFilter Casing Width: 4.9mm\u003cbr\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":39452263940278,"sku":"OPTOLONG-LRGBHa-1.25\"","price":524.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":39452263973046,"sku":"OPTOLONG-LRGBHa-31mm","price":567.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":39452264005814,"sku":"OPTOLONG-LRGBHa-36mm\"","price":623.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":39452264038582,"sku":"OPTOLONG-LRGBHa-2\"","price":808.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-1-25-optolong-lrgb-h-alpha-7nm-5-piece-filter-set-12785959043152.jpg?v=1668534293"},{"product_id":"optolong-venus-u-planetary-filter","title":"Optolong Venus U Planetary Filter","description":"\u003cp\u003eThe Venus-U filter makes it possible to obtain photographs, CCD or video images in the UV-A (320-400nm) and observe Venus' cloud structures.\u003c\/p\u003e\n\u003ch4\u003eMain Use and Performance\u003c\/h4\u003e\n\u003cp\u003eFor use with monochrome CCD cameras. You will need to remove the cover glass of the sensor and internal UV-IR blocker in order to pass UV light. The same holds true for mono DSLRs that have built-in low pass filters, these needs to be removed. For DSLRs you will need a special UV lens together with camera body. The sensor of CCD or CMOS cameras are capable of detecting light in the 350-1100 nm range.\u003c\/p\u003e\n\u003ch4\u003eTechnical Data\u003c\/h4\u003e\n\u003cp\u003eSchott substrate material\u003c\/p\u003e\n\u003cp\u003eThickness 2.0mm\u003cbr\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003cbr\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003cbr\u003e80% maximum transmission at spectral region 320-370nm\u003cbr\u003ePrecision off-band blocking on ultraviolet wavelength 200-280nm, visible and infrared spectral region\u003cbr\u003eCoating Parameter\u003cbr\u003e\u003cbr\u003eMulti-layers anti-reflection coating\u003cbr\u003eNon-cementing optical substrate coating\u003cbr\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength). Not affected by temperature change\u003cbr\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003cbr\u003eFilter Cell\u003cbr\u003e\u003cbr\u003eUltra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is 26mm for 1.25\"; 45mm for 2\")\u003cbr\u003eAirplane Grade Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":30271635488848,"sku":"Optolong-Venus-1.25\"","price":245.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":30271656067152,"sku":"Optolong-Venus-2\"","price":322.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-venus-u-planetary-filter-12786429296720.jpg?v=1668533560"},{"product_id":"optolong-h-alpha-7nm-filter","title":"Optolong Hydrogen-Alpha 7nm Filter","description":"\u003cp\u003e\u003cspan\u003eH-Alpha 7nm filter is the most popular narrowband filter, allowing 7nm bandwidth of light centered on a wavelength of 656nm through. It reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). This is the best choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFine-optically polishing for double-sides-- Ensure accurate λ\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUltrasonic wave cleaning substrate with purified water to remove impurities and dust effectively\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIRO source assisted coating - For durability and resistance to scratching, as well as stability on CWL (central wavelength).  No deviation from temperature change.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConstant stringent quality testing processes - Each filter is tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptolong will spare no effort to serve our customer with outstanding quality products and best service!\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cbr\u003e\n\u003cul\u003e\u003c\/ul\u003e\nCWL(center of wavelength): H-Alpha 656.3nm\u003cbr\u003eFWHM: H-Alpha7nm\u003cbr\u003eTpeak: \u0026lt;85%\u003cbr\u003eOptical Density: OD 3\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism(arc sec): 30s","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":30271806210128,"sku":"Optolong-H-Alpha-7nm-1.25\"","price":226.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":30271806275664,"sku":"Optolong-H-Alpha-7nm-31mm","price":240.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":30271806308432,"sku":"Optolong-H-Alpha-7nm-36mm","price":268.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":30271806242896,"sku":"Optolong-H-Alpha-7nm-2\"","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C","offer_id":30272079462480,"sku":"Optolong-H-Alpha-7nm-Canon-EOS-C","price":311.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-FF","offer_id":32513386774608,"sku":"Optolong-H-Alpha-7nm-Canon-EOS-FF","price":311.0,"currency_code":"CAD","in_stock":true},{"title":"Sony-FF","offer_id":32579525378128,"sku":"Optolong-H-Alpha-7nm-Sony-FF","price":311.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-1-25-optolong-hydrogen-alpha-7nm-filter-12786529730640.png?v=1668534829"},{"product_id":"optolong-cls-light-pollution-filter","title":"Optolong CLS CCD Light Pollution Filter","description":"\u003cp\u003eThe Optolong CLS-CCD broadband filter is designed to improve the visibility of various deep-sky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). The filter is highly transparent in the main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm). It's suitable for enhancing the contrast and details in light-polluted areas.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eCLS-CCD is different from the CLS filter (which is recommended for visual use), with an infrared wavelength 700-1100nm cut-off. It's fit for color CCD cameras and modified DSLRs for astrophotography.\u003c\/p\u003e\n\u003cp\u003eIt works well on most emission nebulae, planetary nebulae and supernova remnants.\u003c\/p\u003e\n\u003cp\u003eYou will see a noticeable boost in contrast and visibility of the fainter outer nebulae detail. \u003c\/p\u003e\n\u003cp\u003eNote that light pollution filters do not eliminate the effects of light pollution or increase the object's brightness. In many cases they instead increase the contrast between nebula and night sky.\u003c\/p\u003e\n\u003cp\u003eWARNING: This filter is not designed for sun observation.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e2. CLS-CCD Spectrum for Reference\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003eHow to read the chart?\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e▲The\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eRED\u003c\/strong\u003e\u003c\/span\u003e line shows the transmission of the filter. The artificial emission lines are shown in \u003cspan\u003e\u003cstrong\u003eORANGE \u003c\/strong\u003ea\u003c\/span\u003end the emission lines from imaging and observation targets are shown in \u003cstrong\u003e\u003cspan\u003eGREEN\u003c\/span\u003e.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":32262450282576,"sku":"OPTOLONG-CLS-CCD-1.25","price":135.0,"currency_code":"CAD","in_stock":true},{"title":"31mm (Unmounted)","offer_id":32579563290704,"sku":"OPTOLONG-CLS-CCD-31mm","price":145.0,"currency_code":"CAD","in_stock":false},{"title":"36mm (Unmounted)","offer_id":32417008123984,"sku":"OPTOLONG-CLS-CCD-36mm","price":149.0,"currency_code":"CAD","in_stock":false},{"title":"2\"","offer_id":32262450315344,"sku":"OPTOLONG-CLS-CCD-2","price":226.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C","offer_id":32262450446416,"sku":"OPTOLONG-CLS-CCD-EOS-C","price":172.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-FF","offer_id":32579544318032,"sku":"OPTOLONG-CLS-CCD-EOS-FF","price":172.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-cls-ccd-light-pollution-filter-14939274117200.jpg?v=1668535007"},{"product_id":"optolong-h-beta-filter","title":"Optolong Hydrogen-Beta 12nm Narrowband Filter","description":"\u003cp\u003e\u003cspan\u003eThe Optolong H-beta filter is designed for nebula observation, with a 12nm bandwidth centered on a wavelength of 486nm (the frequency of Hydrogen-Beta emissions).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe filter is best suited to a large aperture telescope under clear and dark viewing conditions with good seeing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for viewing nebulae such as the Horsehead Nebula and California Nebula.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eH-Beta Spectrum\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers (nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The \u003cstrong\u003eWHITE\u003c\/strong\u003e line shows the transmission of the filter. Artificial light emission lines (light pollution) are shown in \u003cstrong\u003eORANGE \u003c\/strong\u003eand the emission lines from H-alpha, H-Beta and O-III in nebulae are shown in \u003cstrong\u003eGREEN.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":32297466495056,"sku":"Optolong H-Beta 1.25\"","price":126.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":32297466462288,"sku":"Optolong H-Beta 2\"","price":197.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-2-optolong-hydrogen-beta-12nm-narrowband-filter-15012019404880.jpg?v=1668534826"},{"product_id":"optolong-ir-pass-685nm-filter","title":"Optolong IR Pass 685nm Filter","description":"\u003cspan\u003eThe Optolong IR Pass 685nm filter is used to block wavelengths below 670nm and is designed for IR-LRGB imaging in order to produce a sharper luminance image for the best planetary contrast.  This is because atmospheric seeing and distortion is much reduced at longer IR wavelengths.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eCCD and CMOS sensors are capable of detecting light in the 350-1100nm range including infrared wavelengths.  Taking RGB planetary images with IR as the luminance channel will have improved contrast and better surface detail than LRGB images.\u003c\/span\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":32297519186000,"sku":"Optolong IR Pass 685nm 1.25\"","price":112.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":32297519153232,"sku":"Optolong IR Pass 685nm 2\"","price":163.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-ir-pass-685nm-filter-15012333355088.jpg?v=1668534820"},{"product_id":"optolong-uv-ir-cut-filter","title":"Optolong UV IR Cut Filter","description":"\u003cp\u003e\u003cspan\u003eThe Optolong UV IR Cut Filter effectively blocks infrared and ultraviolet frequencies, resulting in the elimination of\u003c\/span\u003e\u003cspan\u003e violet halos around stars and crisper focus with better contrast when used as a luminance filter for planets and the moon.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe filter also reflects heat and acts as an inexpensive dust cover for the more expensive components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":32297584656464,"sku":"Optolong UV IR Cut Filter 1.25\"","price":62.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Unmounted","offer_id":42467053600987,"sku":"Optolong UV IR Cut Filter 31mm","price":64.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":42467053699291,"sku":"Optolong UV IR Cut Filter 36mm","price":78.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":32297584623696,"sku":"Optolong UV IR Cut Filter 2\"","price":92.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-2-optolong-uv-ir-cut-filter-15012398432336.png?v=1668533567"},{"product_id":"optolong-l-extreme-7nm-dual-narrowband-filter-h-alpha-and-o-iii","title":"Optolong L-eXtreme 7nm Dual Narrowband Filter (H-Alpha and O-III)","description":"\u003ch4\u003eIf you'd like maximum light pollution management while using a one-shot colour camera to image H-Alpha and O-III emission targets, the Optolong L-eXtreme is the best filter for the job.\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe L-eXtreme is a 7nm dual band-pass filter which can be used with one-shot color cameras like DSLRs and CCD\/CMOS astrophotography cameras. It's most suited for fast systems or long exposures. The convenience and cost effectiveness of this filter allows amateurs to image emission nebulae even in bright, light-polluted or moonlit skies.\u003cbr\u003e\u003cbr\u003eThe L-eXtreme isolates the H-Alpha and Oxygen III emission lines so that the contrast and signal-to-noise ratio of a nebulae are maximized. For people who are imaging in very light polluted areas or when the moon is out, the L-eXtreme is an excellent choice.\u003cbr\u003e\u003cbr\u003eThe advantage of the L-eXtreme filter is that there is no light transmission between the H-beta and OIII lines (as there are no nebula emission lines there). This reduction in light pollution maximizes the nebula's signal and makes the sky background darker while imaging.\u003cbr\u003e\u003cbr\u003eUnlike the L-eNhance filter, which is a tri-band filter (it transmits H-Alpha, H-Beta, and O-III), the L-eXtreme filter is dual-band, passing just the H-Alpha and O-III emission lines in order to deliver improved light pollution rejection.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cstrong\u003eNote\u003c\/strong\u003e: The Optolong L-eXtreme filters (apart from the threaded both sides version) have threads on one side to keep them very thin - 1.85mm not including the threads - they can be used with \u003ca href=\"https:\/\/telescopescanada.ca\/collections\/filter-wheels\" style=\"color: #2b00ff;\"\u003eFilter Wheels\u003c\/a\u003e, \u003ca href=\"https:\/\/telescopescanada.ca\/products\/2-telescope-filter-drawer-system-with-2-drawers?variant=29091833315408\" style=\"color: #2b00ff;\"\u003eFilter Drawer System\u003c\/a\u003e, focusers with a place to thread focal reducers internally (such as some Moonlite focusers) and camera nose pieces that fit into compression rings, but the 1.85mm filter should not be threaded into the imaging train like an adapter ring with threads on both sides. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #2b00ff;\"\u003eThe threaded both sides version however can be used like an adapter ring and can be threaded directly into your optical train without any additional equipment required. The threaded both sides version has a thickness of 7.6mm not including the threads.  \u003cstrong\u003eNote that this size filter will NOT fit in most filter wheels or drawers.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003eNote: For imaging galaxies and reflection nebulae, the Optolong L-Pro filter is more appropriate as the L-eXtreme and L-eNhance filters will reject much of the light from those broadband or reflection objects.\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eManufacturing Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHigh-precision grinding and polishing to make sure the substrate parallelism is greater than 30\" and the surface accuracy is better than λ\/4 ;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePurified water ultrasonic cleaning is aim to effectively remove impurities and dust from the substrate surface.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eElectron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change; IAD not only consolidates membrane compactness, increases film firmness, but also changes vacuum coating material characteristics.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePlanetary rotation system offers precision and a homogeneous coating ensuring high value on transmission of pass-band and Optical density of off-band;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNon-cementing optical substrate coating;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eQuality Control: each filters is examined by Spectrophotometer for spectrum characteristic, and Laser Interferometer for surface accuracy.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003cstrong\u003ePacking\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: cardboard sleeve box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInner Plastic Box: Strong PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: Imported high pressure white EVA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSubstrate: B270\u003cbr\u003eThickness: 1.85mm\u003cbr\u003eFWHM:  O3 7nm+Ha 7nm\u003cbr\u003eBlocking range: 300-1000nm\u003cbr\u003eBlocking depth: light pollution line blocking \u0026gt;99%\u003cbr\u003eSurface quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism: 30s\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":32334135033936,"sku":"Optolong L-eXtreme 1.25\"","price":339.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":32334135001168,"sku":"Optolong L-eXtreme 2\"","price":439.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" THREADED BOTH SIDES (7.7mm CASING)","offer_id":32334135099472,"sku":"Optolong L-eXtreme 1.25\" Dual Threaded","price":339.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-2-optolong-l-extreme-7nm-dual-narrowband-filter-h-alpha-and-o-iii-15083205394512.jpg?v=1668534640"},{"product_id":"optolong-cls-light-pollution-filter-1","title":"Optolong CLS Visual Light Pollution Filter","description":"\u003cp\u003eThe Optolong CLS broadband filter is designed to improve the visibility of various deep-sky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). The filter is highly transparent in the main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm). It's suitable for enhancing the contrast and details in light-polluted areas.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe CLS filter is different from the CLS-CCD filter - the CLS-CCD comes with an infrared wavelength 700-1100nm cut-off, which is helpful in use with color CCD cameras and modified DSLRs for astrophotography.  For visual use, the CLS filters are appropriate.\u003c\/p\u003e\n\u003cp\u003eIt works well on most emission nebulae, planetary nebulae and supernova remnants.\u003c\/p\u003e\n\u003cp\u003eYou will see a noticeable boost in contrast and visibility of the fainter outer nebulae detail. \u003c\/p\u003e\n\u003cp\u003eNote that light pollution filters do not eliminate the effects of light pollution or increase the object's brightness. In many cases they instead increase the contrast between nebula and night sky.\u003c\/p\u003e\n\u003cp\u003eWARNING: This filter is not designed for sun observation\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":32579555688528,"sku":"OPTOLONG-CLS-1.25","price":78.0,"currency_code":"CAD","in_stock":true},{"title":"31mm (Unmounted)","offer_id":32579578363984,"sku":"OPTOLONG-CLS-31mm","price":75.0,"currency_code":"CAD","in_stock":true},{"title":"36mm (Unmounted)","offer_id":32579555786832,"sku":"OPTOLONG-CLS-36mm","price":79.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":32579555721296,"sku":"OPTOLONG-CLS-2","price":121.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C","offer_id":32579555754064,"sku":"OPTOLONG-CLS-EOS-C","price":135.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-FF","offer_id":32579555819600,"sku":"OPTOLONG-CLS-EOS-FF","price":163.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon-FF","offer_id":32579599401040,"sku":"OPTOLONG-CLS-NK-FF","price":163.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-cls-visual-light-pollution-filter-23319359717558.jpg?v=1668534997"},{"product_id":"optolong-clear-focusing-filter","title":"Optolong Clear Focusing Filter","description":"\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe Optolong Clear Focusing Filter is designed to pass the visible spectral region (420nm-680nm) with 98.5% transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus. Clear focusing filters can be used first to clearly focus the image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eActs as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":37620000587958,"sku":"Optolong Clear Focusing 1.25","price":34.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":37620000555190,"sku":"Optolong Clear Focusing 2","price":43.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-clear-focusing-filter-22854773473462.jpg?v=1668535008"},{"product_id":"optolong-oxygen-iii-6-5nm-filter","title":"Optolong O-III 6.5nm Filter","description":"\u003cp\u003eUse the Optolong O-III 6.5nm filter with the H-alpha and SII-CCD extra narrowband filters (SHO Set) for tricolor CCD astrophotography\u003cbr\u003eNarrowband imaging with a SHO filter set can be done with the moon up in heavy light pollution, allowing you to image much more frequently that would otherwise be possible.\u003cbr\u003eHubble palette images can be made by combining H-alpha, OIII-CCD and SII-CCD images into a color rendering, such as the famous \"Pillars of Creation\" (M16 Eagle Nebula)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFine-optically polishing for double-sides-- Ensure accurate λ\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUltrasonic wave cleaning substrate with purified water to remove impurities and dust effectively\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIRO source assisted coating - For durability and resistance to scratching, as well as stability on CWL (central wavelength).  No deviation from temperature change.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConstant stringent quality testing processes - Each filter is tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOptolong will spare no effort to serve our customer with outstanding quality products and best service!\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cbr\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cbr\u003eFWHM: OIII\u003cspan\u003e 6.5nm\u003c\/span\u003e\u003cbr\u003eTpeak: \u0026lt;85%\u003cbr\u003eOptical Density: OD 3\u003cbr\u003eSurface Quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism(arc sec): 30s","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":42015956435163,"sku":"Optolong O-III 1.25\"","price":199.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":42015956500699,"sku":"Optolong O-III 31mm","price":242.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":42015956566235,"sku":"Optolong O-III 36mm","price":250.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":42015956631771,"sku":"Optolong O-III 2\"","price":314.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-o-iii-6-5nm-filter-34505134309595.jpg?v=1668533751"},{"product_id":"optolong-photometric-filters","title":"Optolong Photometric UBVRcIc Filters","description":"\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eUBVRI filters are not for astrophotography. In fact, they are used to do photometry. So it's in a more scientific application.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1. Photometric Filters\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\"Historically our Solid-State Photometers used custom filters designed to transform well to the Johnson photometry standards with our detectors.\"\u003c\/p\u003e\n\u003cp\u003eUBVRI filters are not for astrophotography. In fact, they are used to do photometry. So it's in a more scientific application. In photometry, you measure the light coming from a star. By calibrating the data with reference stars, we're able to get precise measurements on the flux coming out of a star. Combined with a measurement of the distance of the star (that is usually found by satellite to have precise measurements of far stars), we're able to find fundamental parameters of the stars. Those fundamental parameters are usually the mass, the radius and the temperature of the star.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUBVRcIc filters are not for astrophotography.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003eWARNING\u003c\/u\u003e: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOptical glass fine material\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSpectrum: 300-1000nm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt; 30 seconds parallelism over the both surfaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm\u0026amp;500nm, SII 672nm and H-beta 486nm).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePrecision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. UBVRcIc Photometric Spectrum and \u003c\/strong\u003e\u003cstrong\u003eCharacteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/2b0bc9b7f5c81ec90e88024fd27b821c.png?v=1765062469\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e How to read the chart?\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong L-Pro filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":42310502514907,"sku":"Photometric UBVRcIc Filters 1.25\"","price":973.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":42310513918171,"sku":"Photometric UBVRcIc Filters 36mm","price":1058.0,"currency_code":"CAD","in_stock":false},{"title":"2\"","offer_id":42310502547675,"sku":"Photometric UBVRcIc Filters 2\"","price":1177.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-photometric-ubvrcic-filters-36455534297307.jpg?v=1668533753"},{"product_id":"optolong-3nm-sho-s-ii-h-alpha-o-iii-3-piece-filter-set","title":"Optolong 3nm SHO S-II\/H-Alpha\/O-III Filters","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOptolong SHO-3nm Narrowband Filters Introduction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong SHO-3nm filter kit includes SII 3nm, H-Alpha 3nm, and OIII 3nm narrow band filters, for use with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can also process the data to produce Hubble palette images. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe narrowband S-II 3nm filter  (Sulfur II for CCD) is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 672nm, and reducing light pollution and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eH-Alpha 3nm filters are a popular narrowband filter allowing 3nm bandwidth of light centered on a wavelength of 656nm through, and reducing light pollution and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). This is the better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe narrowband O-III 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission line, and reducing light pollution and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-Alpha and OIIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHigher contrast and greater detailed viewing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDecreases background noise and improved the contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncreased faint nebula signal for brighter objects\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith this narrow band filters kit you can create Hubble palette images\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptimized substrate and coating technology\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReference Spectrum\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/56095a94c3cebfd0ebdc80f423d27c58_2a720b5d-a795-4a67-a969-051754222ff7.png?v=1765062304\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e※This curve is only for reference, actual filter performance may vary in the field based on several factors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The BLUE line shows the transmission of OIII3nm. The H-Alpha 3nm line is shown in GREEN. The SII 3nm filter line is shown in RED. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_1a254566-bc6d-4f45-9fd5-7003a1a1fda2.jpg?v=1765062308\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filters adopt precision coatings based on ion-assisted deposition coating technology for durability and resistance to scratches as well as stability on CWL (central wavelength) - no deviation from temperature changes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·The planetary rotation system offers precision and homogeneity of coatings ensuring highest values of transmission of pass-band and optical density of off-band light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003e\u003cspan\u003e\u003cstrong\u003eOptolong SHO-3nm Narrowband Filters Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eAs we all know, O-III narrow band filters have always have a problem with halos. Thanks to the experience of manufacturing 7nm narrow band filters, the halo of O-III 3nm filters has been minimized by optimizing the coating technology. Optolong conducted a qualitative halo test with the bright star of the Veil Nebula and it can be seen from the original picture that the O-III 3nm filter performs better with bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTelescope：RASA 11\" f2\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCamera：QHY 600\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMount: iOptron CEM120\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong O-III-3nm single 10min frame\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCopyright: Wuzhen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/4397cdca0bb736431cb0f3d9f267cd2b_df5d6523-98cd-4e6e-8748-27538b548090.png?v=1765062312\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eI. \u003cu\u003eThe Bubble Nebula (NGC 7635)  © \u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eAstrodoc Ron Brecher \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAcquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from Ron‘s \u003ca href=\"https:\/\/skyshed.com\/\"\u003eSkyShed\u003c\/a\u003e in Guelph. Average transparency and seeing. Data acquired Oct 18-19, 2021 under a brightly moonlit sky (Moon 12 days old)..\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSky-Watcher Esprit 150 f\/7 refractor and QHY600M camera with Optolong H-alpha, O(III) and S(II) 3nm filters – FIRST LIGHT WITH 3nm BAND-PASS FILTERS\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHa: 9 x 20m = 3hr00m\u003cbr\u003eO3: 10 x 20m = 3hr20m\u003cbr\u003eS2: 9 x 20m = 3hr00m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTotal: 9hr20m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImage scale 0.72 arc sec per pixel \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/14a06805527ed873c87d3906b9ff5480_c303effd-564b-4444-926a-5e8f23e3921a.jpg?v=1765062316\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅡ.\u003cu\u003e Pac-Man Nebula NGC 281 in the Hubble Palette  © \u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eLuca Fornaciari Astrophotography  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePac-Man Nebula NGC 281 in the Hubble Palette\u003cbr\u003eWith the bad weather persisting I have taken these last few weeks to experiment with new way in the development of narrowband shots.\u003cbr\u003eI'm happy because I'm defining a Hubble Palette that really feels mine, designing it a little at a time.\u003cbr\u003eNarrowband is creative and fun because it allows us a good deal of freedom to experiment with the integration of the individual channels and the image you see is a developing version of what I am building.\u003cbr\u003eThe image was obtained with the new 3nm Optolong filters. If the bad weather will allow me a few nights I will soon finish my tests on these filters, but for now the impressions are really good.\u003cbr\u003e240 minutes of Ha, 510 of OIII and 260 minutes of SII with the ASI 294MM and the Sky-Watcher 300 f\/4.\u003cbr\u003eI wish you a beautiful sunny day!\u003cbr\u003eSETUP:\u003cbr\u003eSky-Watcher 300 f \/ 4 on EQ8R-Pro\u003cbr\u003eZWO ASI 294MM, \u003cstrong\u003eOptolong Filters Ha 3nm, OIII 3nm, SII 3nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo?fbid=317253446884697\u0026amp;set=a.294756879134354\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/991d6920cac738a1ac8277a582bac7dd_42abfa34-a6ad-40af-9b60-f99845a44dfd.jpg?v=1765062319\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIII.\u003cu\u003e NGC7000  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFinalmente, dopo mesi, sono riuscito a testare parte dei nuovi filtri Optolong Astronomy Filter\u003cstrong\u003e ha 3nm\u003c\/strong\u003e ancora non sul mercato (sono un beta tester).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/cd8b15936c6847961837359233668f42_f9e8bb03-3669-435e-aaa5-939eff4abd17.jpg?v=1765062322\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅣ.\u003cu\u003e Nebulose Nord America  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest dei nuovi filtri Optolong Astronomy Filter H alpha e OIII a 3nm (non ancora sul mercato) sotto cieli inquinati (Bortle 8\/9), con camera a colori e diametro limitato.\u003cbr\u003eElaborazione basica, senza considerare il color delle stelle.\u003cbr\u003ePurtroppo il meteo mi ha concesso circa 3 ore per canale, manca ancora l'SII per comporre l'Hubble palette, spero di poter terminare la prossima settimana.\u003cbr\u003eLights: \u003cstrong\u003e12x900s (Ha 3nm) + 20x600s (OIII 3nm)\u003c\/strong\u003e\u003cbr\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr\u003eCamera: QHY 168C\u003cbr\u003eMount: Sky-Watcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221731702215327\u0026amp;set=a.1349013078910\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/287447fea211bf2ccedc07827566b595_459c9ffe-53d0-4736-acd1-d94dac273f8e.jpg?v=1765062326\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eV.\u003cu\u003e North America \u0026amp; Pelican Nebulae (Hubble Palette)  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eShooting took place on 1,4,27 and 28 October 2021 in Taranto (Italy) at about 20m above sea level.\u003cbr\u003eLights: 16x900s Ha + 21x600s OIII + 9x900s OIII + 16x900s SII\u003cbr\u003eSky: Bortle 9\u003cbr\u003eTotal exposure: 13,75 h\u003cbr\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr\u003eCamera: QHY 168C\u003cbr\u003eFilters: Optolong Astronomy Filter \u003cstrong\u003eHa, OIII, SII 3nm\u003c\/strong\u003e\u003cbr\u003eMount: Sky-Watcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221855955121572\u0026amp;set=a.1349013078910\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/128c7ecb6dab1b8929703eb3a4c2112b_f30a7c21-6865-4187-a2b1-35ef78d8757a.jpg?v=1765062330\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅥ.\u003cu\u003e The Lobster Claw Nebula  © Astrodoc Ron Brecher\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAcquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from my \u003ca href=\"https:\/\/skyshed.com\/\"\u003eSkyShed\u003c\/a\u003e in Guelph. Average transparency and seeing. Acquired October 28-November 8, 2021 under a partly moonlit sky.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSky-Watcher Esprit 150 f\/7 refractor and QHY600M camera with \u003cstrong\u003eOptolong H-alpha, O(III) and S(II) 3nm filters\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eChrominance: Takahashi FSQ-106 ED IV @ f\/5 and QHY367C Pro one-shot colour camera with Optolong UV\/IR filter. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHa: 22 x 20m = 7hr20m\u003cbr\u003eO3: 22 x 20m = 7hr20m\u003cbr\u003eS2: 22 x 20m = 7hr20m189 x 5m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOSC = 15hr45m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTotal: 22hr for narrowband image; 37hr45m for broadband\/narrowband blend\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImage scale 0.72 arc sec per pixel  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProcessing workflow is for the Hubble Palette image. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe broadband image was processed similar to \u003ca href=\"https:\/\/astrodoc.ca\/ic-5068\/\"\u003eIC 5068\u003c\/a\u003e, with the luminance of the narrowband image used instead of Ha alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eData Reduction and Cleanup\u003cbr\u003eThe WeightedBatchPreProcessing script was used to perform calibration, cosmetic correction, weighting, registration and integration of all frames. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astrodoc.ca\/lobster-claw\/?fbclid=IwAR2RGCHZvQBaqsNOhFm83nRrC5pVHXXq9iVBC_Qy0NIj7BYAaGp9AgSKn5I\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/f91f0bc04fb22c68f6c0ac11fa7b00ab_0ac99790-8624-472f-bb43-e8d0e2109a3c.jpg?v=1765062333\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅦ.\u003cu\u003e NGC6960 © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=2981303708797488\u0026amp;set=a.1385013411759867\"\u003eAndrea Andreotto Maggi Astrophoto\u003c\/a\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTelescopio Artec 200\u003cbr\u003eCamera ZWO Asi 294 MM\u003cbr\u003eFiltri Optolong Astronomy Filter \u003cstrong\u003eRGB HA 3nm OIII 3nm\u003c\/strong\u003e\u003cbr\u003e60 Light RED 300 sec\u003cbr\u003e60 Light GREEN 300 sec\u003cbr\u003e60 Light BLUE 300 sec\u003cbr\u003e36 light HA 600 sec\u003cbr\u003e36 light OIII 600 sec\u003cbr\u003eMontatura 10 Micron 1000 hps\u003cbr\u003eSoftware Voyager Astrophotography Automation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ce882079db0e723d48abd5b89337cc5e_a5082e60-a426-4717-b3af-1a3ecf96daf8.jpg?v=1765062337\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅧ.\u003cu\u003e Rosette nebula © \u003ca href=\"https:\/\/www.facebook.com\/photo?fbid=2990297881231404\u0026amp;set=a.1385013411759867\"\u003eAndrea Andreotto Maggi Astrophoto\u003c\/a\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProve di post su vecchie riprese\u003cbr\u003eTelescopi o obiettivi di acquisizione: Sharpstar 76EDPH · \u003cbr\u003eCamera ZWO asi 071 MC ZWO Asi 1600 MM ZWO asi 2600 MC \u003cbr\u003eMontature: Sky-Watcher EQ6 PRO GoTo \u003cbr\u003eFiltri: Optolong \u003cstrong\u003e2\" Ha O3 S2\u003c\/strong\u003e · Optolong L-Pro 2\" · Optolong L-eNhance\u003cbr\u003e58 light 300 sec\u003cstrong\u003e L-PRO\u003c\/strong\u003e\u003cbr\u003e70 light 600 sec \u003cstrong\u003eL-eNhance\u003c\/strong\u003e\u003cbr\u003e20 light 600 sec HA\u003cbr\u003e20 Light 600 sec OIII\u003cbr\u003e20 Light 600 sec SII \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ee5691a92bcf2b9f7a7ccf80c878359b_9286a583-bc60-4722-af5a-d91bb1045be8.jpg?v=1765062341\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅨ.\u003cu\u003e Ha3nm test © YaGe\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLens: SharpStar ACL200\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCamera: ZWO ASI 6200 MM Pro\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMount: iOptron CEM60\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGuide: SharpStar ACL200\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eStar guide camera: ZWO ASI290MM mini\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSoftware: Pleiades Astrophoto PixInisight ·\u003c\/span\u003e\u003cspan\u003eAstro Pixel Processor \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter: \u003cstrong\u003eOptolong Ha 3nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCopyright：鸭哥\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/1aa189a6260eac8d82b96ce1f393bea0_4a62b6fb-e832-4c2e-8025-718d472277e0.png?v=1765062344\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About product color: Due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About the coating: The interference filter will show different colors under different light, which is a normal phenomenon. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About the product style: In order to improve the product, changes to design\/appearance\/parameters may be updated over time.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About the product description: The different sizes of this product have the same material, technology and design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/22c5068a8f4783079f93c42761aa9238_b37324d9-b180-4f76-a0e6-bb867617c014.png?v=1765062348\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"36mm 3nm Unmounted SHO Kit (3 filters)","offer_id":42310543769819,"sku":"Optolong 3nm SHO 36mm","price":1363.0,"currency_code":"CAD","in_stock":true},{"title":"2\" 3nm SHO Kit (3 filters)","offer_id":42310543802587,"sku":"Optolong 3nm SHO 2\"","price":1703.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-3nm-sho-s-ii-h-alpha-o-iii-filters-36455684604123.png?v=1668535358"},{"product_id":"optolong-3nm-oxygen-iii-filter","title":"Optolong 3nm Oxygen-III Filter","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOptolong SHO-3nm Narrowband Filters Introduction (This listing is for the Oxygen-III filter only)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong SHO-3nm filter kit includes SII 3nm, H-Alpha 3nm, and OIII 3nm narrow band filters, for use with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can also process the data to produce Hubble palette images. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe narrowband S-II 3nm filter  (Sulfur II for CCD) is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 672nm, and reducing light pollution and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eH-Alpha 3nm filters are a popular narrowband filter allowing 3nm bandwidth of light centered on a wavelength of 656nm through, and reducing light pollution and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). This is the better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe narrowband O-III 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission line, and reducing light pollution and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-Alpha and OIIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHigher contrast and greater detailed viewing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDecreases background noise and improved the contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncreased faint nebula signal for brighter objects\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith this narrow band filters kit you can create Hubble palette images\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptimized substrate and coating technology\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReference Spectrum\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/56095a94c3cebfd0ebdc80f423d27c58_1aab5840-9ba6-4b34-a1e3-3e0f91bf7790.png?v=1765062255\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e※This curve is only for reference, actual filter performance may vary in the field based on several factors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The BLUE line shows the transmission of OIII3nm. The H-Alpha 3nm line is shown in GREEN. The SII 3nm filter line is shown in RED. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_f57fa1be-5d15-499b-ab25-1a2f02d0984b.jpg?v=1765062259\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filters adopt precision coatings based on ion-assisted deposition coating technology for durability and resistance to scratches as well as stability on CWL (central wavelength) - no deviation from temperature changes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·The planetary rotation system offers precision and homogeneity of coatings ensuring highest values of transmission of pass-band and optical density of off-band light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003e\u003cspan\u003e\u003cstrong\u003eOptolong SHO-3nm Narrowband Filters Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eAs we all know, O-III narrow band filters have always have a problem with halos. Thanks to the experience of manufacturing 7nm narrow band filters, the halo of O-III 3nm filters has been minimized by optimizing the coating technology. Optolong conducted a qualitative halo test with the bright star of the Veil Nebula and it can be seen from the original picture that the O-III 3nm filter performs better with bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTelescope：RASA 11\" f2\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCamera：QHY 600\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMount: iOptron CEM120\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong O-III-3nm single 10min frame\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCopyright: Wuzhen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/4397cdca0bb736431cb0f3d9f267cd2b_ba1081d3-31db-4b73-8f18-55bcad5dc83b.png?v=1765062263\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eI. \u003cu\u003eThe Bubble Nebula (NGC 7635)  © \u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eAstrodoc Ron Brecher \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAcquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from Ron‘s \u003ca href=\"https:\/\/skyshed.com\/\"\u003eSkyShed\u003c\/a\u003e in Guelph. Average transparency and seeing. Data acquired Oct 18-19, 2021 under a brightly moonlit sky (Moon 12 days old)..\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSky-Watcher Esprit 150 f\/7 refractor and QHY600M camera with Optolong H-alpha, O(III) and S(II) 3nm filters – FIRST LIGHT WITH 3nm BAND-PASS FILTERS\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHa: 9 x 20m = 3hr00m\u003cbr\u003eO3: 10 x 20m = 3hr20m\u003cbr\u003eS2: 9 x 20m = 3hr00m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTotal: 9hr20m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImage scale 0.72 arc sec per pixel \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/14a06805527ed873c87d3906b9ff5480_6a65ba5e-b55f-439a-a5fe-a2a3aa18a8fd.jpg?v=1765062266\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅡ.\u003cu\u003e Pac-Man Nebula NGC 281 in the Hubble Palette  © \u003ca href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eLuca Fornaciari Astrophotography  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePac-Man Nebula NGC 281 in the Hubble Palette\u003cbr\u003eWith the bad weather persisting I have taken these last few weeks to experiment with new way in the development of narrowband shots.\u003cbr\u003eI'm happy because I'm defining a Hubble Palette that really feels mine, designing it a little at a time.\u003cbr\u003eNarrowband is creative and fun because it allows us a good deal of freedom to experiment with the integration of the individual channels and the image you see is a developing version of what I am building.\u003cbr\u003eThe image was obtained with the new 3nm Optolong filters. If the bad weather will allow me a few nights I will soon finish my tests on these filters, but for now the impressions are really good.\u003cbr\u003e240 minutes of Ha, 510 of OIII and 260 minutes of SII with the ASI 294MM and the Sky-Watcher 300 f\/4.\u003cbr\u003eI wish you a beautiful sunny day!\u003cbr\u003eSETUP:\u003cbr\u003eSky-Watcher 300 f \/ 4 on EQ8R-Pro\u003cbr\u003eZWO ASI 294MM, \u003cstrong\u003eOptolong Filters Ha 3nm, OIII 3nm, SII 3nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo?fbid=317253446884697\u0026amp;set=a.294756879134354\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/991d6920cac738a1ac8277a582bac7dd_87ef9922-1fb7-4e29-8283-59c3915884eb.jpg?v=1765062270\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIII.\u003cu\u003e NGC7000  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFinalmente, dopo mesi, sono riuscito a testare parte dei nuovi filtri Optolong Astronomy Filter\u003cstrong\u003e ha 3nm\u003c\/strong\u003e ancora non sul mercato (sono un beta tester).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/cd8b15936c6847961837359233668f42_ba0e4295-2352-4ba7-8717-e659de4ac9e8.jpg?v=1765062273\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅣ.\u003cu\u003e Nebulose Nord America  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest dei nuovi filtri Optolong Astronomy Filter H alpha e OIII a 3nm (non ancora sul mercato) sotto cieli inquinati (Bortle 8\/9), con camera a colori e diametro limitato.\u003cbr\u003eElaborazione basica, senza considerare il color delle stelle.\u003cbr\u003ePurtroppo il meteo mi ha concesso circa 3 ore per canale, manca ancora l'SII per comporre l'Hubble palette, spero di poter terminare la prossima settimana.\u003cbr\u003eLights: \u003cstrong\u003e12x900s (Ha 3nm) + 20x600s (OIII 3nm)\u003c\/strong\u003e\u003cbr\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr\u003eCamera: QHY 168C\u003cbr\u003eMount: Sky-Watcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221731702215327\u0026amp;set=a.1349013078910\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/287447fea211bf2ccedc07827566b595_590d47ec-4e49-4b54-9a1d-cb82af544643.jpg?v=1765062277\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eV.\u003cu\u003e North America \u0026amp; Pelican Nebulae (Hubble Palette)  © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eShooting took place on 1,4,27 and 28 October 2021 in Taranto (Italy) at about 20m above sea level.\u003cbr\u003eLights: 16x900s Ha + 21x600s OIII + 9x900s OIII + 16x900s SII\u003cbr\u003eSky: Bortle 9\u003cbr\u003eTotal exposure: 13,75 h\u003cbr\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr\u003eCamera: QHY 168C\u003cbr\u003eFilters: Optolong Astronomy Filter \u003cstrong\u003eHa, OIII, SII 3nm\u003c\/strong\u003e\u003cbr\u003eMount: Sky-Watcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221855955121572\u0026amp;set=a.1349013078910\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/128c7ecb6dab1b8929703eb3a4c2112b_99c1615c-3fb3-4567-8be5-e392728f034f.jpg?v=1765062281\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅥ.\u003cu\u003e The Lobster Claw Nebula  © Astrodoc Ron Brecher\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAcquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from my \u003ca href=\"https:\/\/skyshed.com\/\"\u003eSkyShed\u003c\/a\u003e in Guelph. Average transparency and seeing. Acquired October 28-November 8, 2021 under a partly moonlit sky.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSky-Watcher Esprit 150 f\/7 refractor and QHY600M camera with \u003cstrong\u003eOptolong H-alpha, O(III) and S(II) 3nm filters\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eChrominance: Takahashi FSQ-106 ED IV @ f\/5 and QHY367C Pro one-shot colour camera with Optolong UV\/IR filter. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHa: 22 x 20m = 7hr20m\u003cbr\u003eO3: 22 x 20m = 7hr20m\u003cbr\u003eS2: 22 x 20m = 7hr20m189 x 5m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOSC = 15hr45m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTotal: 22hr for narrowband image; 37hr45m for broadband\/narrowband blend\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImage scale 0.72 arc sec per pixel  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProcessing workflow is for the Hubble Palette image. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe broadband image was processed similar to \u003ca href=\"https:\/\/astrodoc.ca\/ic-5068\/\"\u003eIC 5068\u003c\/a\u003e, with the luminance of the narrowband image used instead of Ha alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eData Reduction and Cleanup\u003cbr\u003eThe WeightedBatchPreProcessing script was used to perform calibration, cosmetic correction, weighting, registration and integration of all frames. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astrodoc.ca\/lobster-claw\/?fbclid=IwAR2RGCHZvQBaqsNOhFm83nRrC5pVHXXq9iVBC_Qy0NIj7BYAaGp9AgSKn5I\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/f91f0bc04fb22c68f6c0ac11fa7b00ab_f3941f8d-e135-4274-8dc9-f860cdb53f64.jpg?v=1765062284\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅦ.\u003cu\u003e NGC6960 © \u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=2981303708797488\u0026amp;set=a.1385013411759867\"\u003eAndrea Andreotto Maggi Astrophoto\u003c\/a\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTelescopio Artec 200\u003cbr\u003eCamera ZWO Asi 294 MM\u003cbr\u003eFiltri Optolong Astronomy Filter \u003cstrong\u003eRGB HA 3nm OIII 3nm\u003c\/strong\u003e\u003cbr\u003e60 Light RED 300 sec\u003cbr\u003e60 Light GREEN 300 sec\u003cbr\u003e60 Light BLUE 300 sec\u003cbr\u003e36 light HA 600 sec\u003cbr\u003e36 light OIII 600 sec\u003cbr\u003eMontatura 10 Micron 1000 hps\u003cbr\u003eSoftware Voyager Astrophotography Automation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ce882079db0e723d48abd5b89337cc5e_8496da2f-e3ee-4b3e-a86a-74975e81fb7c.jpg?v=1765062288\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅧ.\u003cu\u003e Rosette nebula © \u003ca href=\"https:\/\/www.facebook.com\/photo?fbid=2990297881231404\u0026amp;set=a.1385013411759867\"\u003eAndrea Andreotto Maggi Astrophoto\u003c\/a\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProve di post su vecchie riprese\u003cbr\u003eTelescopi o obiettivi di acquisizione: Sharpstar 76EDPH · \u003cbr\u003eCamera ZWO asi 071 MC ZWO Asi 1600 MM ZWO asi 2600 MC \u003cbr\u003eMontature: Sky-Watcher EQ6 PRO GoTo \u003cbr\u003eFiltri: Optolong \u003cstrong\u003e2\" Ha O3 S2\u003c\/strong\u003e · Optolong L-Pro 2\" · Optolong L-eNhance\u003cbr\u003e58 light 300 sec\u003cstrong\u003e L-PRO\u003c\/strong\u003e\u003cbr\u003e70 light 600 sec \u003cstrong\u003eL-eNhance\u003c\/strong\u003e\u003cbr\u003e20 light 600 sec HA\u003cbr\u003e20 Light 600 sec OIII\u003cbr\u003e20 Light 600 sec SII \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ee5691a92bcf2b9f7a7ccf80c878359b_1212ea1a-34b4-4305-b038-3a01353d151b.jpg?v=1765062291\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eⅨ.\u003cu\u003e Ha3nm test © YaGe\u003ca href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLens: SharpStar ACL200\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCamera: ZWO ASI 6200 MM Pro\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMount: iOptron CEM60\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGuide: SharpStar ACL200\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eStar guide camera: ZWO ASI290MM mini\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSoftware: Pleiades Astrophoto PixInisight ·\u003c\/span\u003e\u003cspan\u003eAstro Pixel Processor \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter: \u003cstrong\u003eOptolong Ha 3nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCopyright：鸭哥\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/1aa189a6260eac8d82b96ce1f393bea0_70ece3e2-19b3-4bed-acab-d759bf0664ec.png?v=1765062295\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About product color: Due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About the coating: The interference filter will show different colors under different light, which is a normal phenomenon. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About the product style: In order to improve the product, changes to design\/appearance\/parameters may be updated over time.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e●About the product description: The different sizes of this product have the same material, technology and design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/22c5068a8f4783079f93c42761aa9238_16f2dccb-2056-411f-bfa4-f99af58ddca3.png?v=1765062299\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"36mm Unmounted","offer_id":42689927807195,"sku":"Optolong 3nm O-III 36mm","price":481.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":42689927839963,"sku":"Optolong 3nm O-III 2\"","price":595.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-3nm-oxygen-iii-filter-37061491720411.png?v=1668535361"},{"product_id":"optolong-l-ultimate-3nm-dual-narrowband-filter-h-alpha-and-o-iii","title":"Optolong L-Ultimate 3nm Dual Narrowband Filter (H-Alpha and O-III)","description":"\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe L -Ultimate is a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Used with DSLR, color\/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIt is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable align=\"center\" border=\"1\" cellpadding=\"1\" cellspacing=\"2\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSubstrate\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e30seconds\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":44157235593435,"sku":"Optolong L-Ultimate-1.25\"","price":410.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":44157235560667,"sku":"Optolong L-Ultimate-2\"","price":552.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/optolong-filter-optolong-l-ultimate-3nm-dual-narrowband-filter-h-alpha-and-o-iii-38140063514843.jpg?v=1668363819"},{"product_id":"optolong-l-extreme-f2-fast-optics-dual-narrowband-filter-h-alpha-and-o-iii","title":"Optolong L-eXtreme F2 Fast Optics Dual Narrowband Filter (H-Alpha and O-III)","description":"\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e1.  L-eXtreme F2 Introduction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eOptolong L-eXtreme F2 is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterized spectral lines (OIII, Ha) as the main transmission wavelengths, the OIII and H-Alpha nebula emission lines pass accurately at f2 - f3.3 Focal Ratio.   It's a product that Optolong has developed specifically for fast optical systems, or fast focal ratio imaging systems. It has performed well on RASA, HyperStar and other fast ratio telescopes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eKey Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e♦Together with one-shot colour astronomical cameras, monochrome astronomical cameras, and Digital DSLR cameras, you can fast and quickly obtain clear and detailed images of the deep sky;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e♦Ideal for fast optical system, like RASA, Hyperstar and other fast focal ratio telescope users;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e♦Recommended for using fast optical system with focal ratio from f2 to f3.3;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e♦Anti-light pollution, better contrast, more details of the celestial bodies: This filter cuts out background light and noise beyond the target celestial bodies to get better details and contrast of the images. L-eXtreme F2 can effectively block light pollution so that the images will not affected by unwanted lights, and sky light of the background. You can quickly get satisfactory pictures in fast optical systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e2.Spectrum and Characteristic\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable data-mce-fragment=\"1\" cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSbustrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eoptical glass\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e1.85mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eOIII 7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eHa 7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eBlocking range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e300-1000nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eBlocking Depth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSurface quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e60\/40\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eTransmitted Wavefront RMS\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eλ\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Parallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e30s\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, the L-eXtreme F2 retains the prominent nebula OIII and Ha colours while blocking most of the light pollution. Specifically designed and optimally calculated for the characteristics of a fast optical system, the L-eXtreme F2 always keeps both OIII and Ha bands having high transmittance, which helps users to capture nebulae emission lines in these bands more accurately and quickly, and obtain better astrophotographic images.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/30eaf24fdaf807b26d773ea5807517e4.jpg?v=1765062402\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/30eaf24fdaf807b26d773ea5807517e4.jpg?v=1765062402\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e※This curve is only for reference, and is not used as the final product data.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_bf8ff3d2-d209-4cb5-8b6d-d88bc0ba9269.jpg?v=1765062405\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_bf8ff3d2-d209-4cb5-8b6d-d88bc0ba9269.jpg?v=1765062405\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/22c5068a8f4783079f93c42761aa9238_58da9ff0-34a0-4c50-81ea-85b489b14672.png?v=1765062409\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/22c5068a8f4783079f93c42761aa9238_58da9ff0-34a0-4c50-81ea-85b489b14672.png?v=1765062409\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e4. L-eXtreme F2 Gloable Price\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable data-mce-fragment=\"1\" cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSpecification\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eUnit Price in USD dollars\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e2\" mounted\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e $308\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e5. Packing\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eOuter Box: silver box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eLining: imported high pressure white EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/a853b9fa6cd8dff29d844be5e277a9e7.jpg?v=1765062413\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/a853b9fa6cd8dff29d844be5e277a9e7.jpg?v=1765062413\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e6. L-eXtreme F2 Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eI. Test of the new Optolong Astronomy Filter L-Extreme F2 filter ©  Tommaso Massimo Stella     \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSadr and the Belly of the Cygnus.\u003cbr data-mce-fragment=\"1\"\u003eSadr is a yellow super giant star, 33,000 times more luminous than the Sun and 12 times more massive.\u003cbr data-mce-fragment=\"1\"\u003eIt is identified in the center of this wide-field image which portrays the center of the Northern cross (internal asterism in the constellation Cygnus). At bottom center and to the left, the Crescent nebula and the effects (cyan color, OIII) of the star Wolf-Rayet 134 can be seen.\u003cbr data-mce-fragment=\"1\"\u003eThe filter under test is designed to work with super fast optics centered on a focal ratio of 2. For the occasion, a full aperture Samyang 135mm f\/2 lens connected to the Omegon veTec571V4 camera was used.\u003cbr data-mce-fragment=\"1\"\u003eThe result is the stack of 11 exposures of 300 seconds and the processing was limited to the adjustment of the curves and a minimal stellar reduction without the use of AI tools.\u003cbr data-mce-fragment=\"1\"\u003eSky: SQM 19.95\u003cbr data-mce-fragment=\"1\"\u003eIn the first comment you can find insights into the test.\u003cbr data-mce-fragment=\"1\"\u003eSoon you will see published a more complete work on much weaker subjects.\u003cbr data-mce-fragment=\"1\"\u003eCredit: Tommaso Massimo Stella\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo?fbid=10225422708688182\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo?fbid=10225422708688182\u0026amp;set=a.1349013078910\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/f21441527c08dc44ee513c1a500446de.jpg?v=1765062416\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/f21441527c08dc44ee513c1a500446de.jpg?v=1765062416\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eII. The Bubble Nebula ©Luke Newbould \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e52x2m exposures, RASA11, Player One Uranus-C Pro camera\u003cbr data-mce-fragment=\"1\"\u003eOptolong-L-Extreme f2 filter\u003cbr data-mce-fragment=\"1\"\u003eCaptured with NINA, \u003cbr data-mce-fragment=\"1\"\u003eStacked with AstroPixelProcessor, \u003cbr data-mce-fragment=\"1\"\u003eProcessed in PixInsight\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/21cee766946b225cc7089f5074877030.jpg?v=1765062420\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/21cee766946b225cc7089f5074877030.jpg?v=1765062420\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eIII. NGC 6871, WR 134 \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e©João Berbereia\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eTest with the new Filter Dual Narrowband L-eXtreme for F2 2\". The filter captures the light emitted by ionized hydrogen atoms (Hα 7nm) and doubly ionized oxygen ions (OIII 7nm) in the spectra of astronomical objects, such as nebulas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThis image was capture for a duration of 30x300 seconds, totaling 2 hours and 50 minutes. It was taken from my backyard on August 14, 2023, on Terceira Island, Azores, Portugal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGear Info:\u003cbr data-mce-fragment=\"1\"\u003eCelestron C8 HD + Hyperstar V4 （f1.9） 390mm\u003cbr data-mce-fragment=\"1\"\u003eiOptron CEM40EC\u003cbr data-mce-fragment=\"1\"\u003eASI071MC -10 100gain\u003cbr data-mce-fragment=\"1\"\u003eOptolong L-eXtreme F2 2\"\u003cbr data-mce-fragment=\"1\"\u003eEAF\u003cbr data-mce-fragment=\"1\"\u003eASI290MM\u003cbr data-mce-fragment=\"1\"\u003eSky-Watcher 50ED\u003cbr data-mce-fragment=\"1\"\u003eASIAIR\u003cbr data-mce-fragment=\"1\"\u003eBortle 4 - moon3% \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/9fb69e0a83b62c3a6b297b5dc30c3dbd.jpg?v=1765062423\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/9fb69e0a83b62c3a6b297b5dc30c3dbd.jpg?v=1765062423\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eIV.  Rosette Nebula © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/astronomono007\/posts\/pfbid0EjnNGx2fDHi8DYcAQhPyQ6P4RDysEF9Suc5tmAdFEae4Sd9jMrY7owZKKCFkg92sl\" data-mce-href=\"https:\/\/www.facebook.com\/astronomono007\/posts\/pfbid0EjnNGx2fDHi8DYcAQhPyQ6P4RDysEF9Suc5tmAdFEae4Sd9jMrY7owZKKCFkg92sl\"\u003eAstrono Mono\u003c\/a\u003e \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eRosette Nebula, also known as Caldwell 49, is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, as the stars in the cluster formed from matter in the nebula.\u003cbr data-mce-fragment=\"1\"\u003eThe nebula has been observed to have a shape reminiscent of a human skull and is sometimes referred to as the \"Skull Nebula\". It should not be confused with NGC 246, which is also nicknamed the \"Skull Nebula\". \u003cbr data-mce-fragment=\"1\"\u003eTechnical data :\u003cbr data-mce-fragment=\"1\"\u003e45 x 300s L-eXtreme f\/2\u003cbr data-mce-fragment=\"1\"\u003eTakahashi Epsilon 180 ED (f2.8 focal ratio)\u003cbr data-mce-fragment=\"1\"\u003eZWO ASI2600MC-Pro Camera -10° ZWO ASI2600MC-Pro Camera -10° ZWO ASI2600MC-Pro Camera -10\u003cbr data-mce-fragment=\"1\"\u003eZWO EAF+ ZWO EFW + ZWO ASI AIR PRO\u003cbr data-mce-fragment=\"1\"\u003eZWO ASI 462 MC Guide Camera - Guide scope Orion 80edcf\u003cbr data-mce-fragment=\"1\"\u003esqm 18.53 CGEM mount\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/astronomono007\/posts\/pfbid0EjnNGx2fDHi8DYcAQhPyQ6P4RDysEF9Suc5tmAdFEae4Sd9jMrY7owZKKCFkg92sl\" data-mce-href=\"https:\/\/www.facebook.com\/astronomono007\/posts\/pfbid0EjnNGx2fDHi8DYcAQhPyQ6P4RDysEF9Suc5tmAdFEae4Sd9jMrY7owZKKCFkg92sl\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/8fff0674968eaf86bc57956e4d2abb66.jpg?v=1765062427\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/8fff0674968eaf86bc57956e4d2abb66.jpg?v=1765062427\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eV. The Cygnus Loop \u003c\/strong\u003e\u003c\/span\u003e\u003c\/u\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e© Georg Nyman\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAstrophotographer Georg was taking images with RASA and the full frame QHY600C camera. \u003cbr data-mce-fragment=\"1\"\u003eThe Cygnus Loop – an object which is a very well known target of Ha and OIII. Indeed, Optolong L-eXtreme F2 performed very well and the separation of Ha and OIII is excellent – see attached result. \u003cbr data-mce-fragment=\"1\"\u003eThe image is a 2x1 mosaic\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eCredit: Dr. Georg N. Nyman\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/32f461d9fec6c329d304c68e73346b82.jpg?v=1765062431\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/32f461d9fec6c329d304c68e73346b82.jpg?v=1765062431\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":44259266592987,"sku":"Optolong L-EXTREME-F2","price":439.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-l-extreme-f2-fast-optics-dual-narrowband-filter-h-alpha-and-o-iii-39944866562267.jpg?v=1694106493"},{"product_id":"optolong-l-quad-enhance-filter-l-qef-quad-bandpass-light-pollution-suppression-filter","title":"Optolong 2\" L-Quad Enhance Filter (L-QEF) Quad Bandpass Light Pollution Suppression Filter","description":"\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eL-QEF cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast. This filter is a broadband filter that suppresses light pollution wavelengths. It is good for star clusters, dark and reflection nebulae, and galaxies from light-polluted skies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1.  L-Quad Enhance Filter (L-QEF) \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eL-Quad Enhance Filter (L-QEF) is a quad band-pass light pollution suppression filter for colour cameras. It effectively suppresses the transmission of light pollution wavelengths, especially light pollution generated by artificial lighting (including mercury and sodium lamps), as well as the effects of natural skylight-induced effects on the shot, thus effectively enhancing the contrast and details of the celestial bodies, and making the objects more distinct and stereoscopic. This filter provides better color balance while improving resistance of light pollution. L-QEF can be used for both wide field astrophotography, such as the Milky Way in Summer and Winter, and deep sky objects such as nebulae, galaxies, star clusters, and so forth; It allows you to save a lot of time during the shooting process and get better results at the same time. The design of quad band-pass maximizes the colour balance of nebulae, galaxies and other broadband spectral targets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e♦Cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast;\u003c\/p\u003e\n\u003cp\u003e♦Signal-to-noise ratio (SNR);\u003c\/p\u003e\n\u003cp\u003e♦Near IR cut-off to 1000nm, reducing the effects of IR noise;\u003c\/p\u003e\n\u003cp\u003e♦L-QEF has more than 90% transmittance of the nebula emission lines at H-Beta\/OIII\/H-Alpha\/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortle 1 to Bortle 7 levels; (Bortle 8, Bortle 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.);\u003c\/p\u003e\n\u003cp\u003e♦Suitable for wide range of deep sky targets: it covers most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. L-QEF is superior to other filters of the same type.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2.Spectrum and Characteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSbustrate\u003c\/td\u003e\n\u003ctd\u003eoptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eQuad band-pass filter\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eOD2-OD4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Parallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, L-Quad Enhance filter effectively reduces the impact of light pollution and suppresses the background light of astronomical objects, thus effectively enhancing the contrast and details of the celestial bodies. Using L-QEF filter can help you save a lot of time during the shooting process, yet obtaining incredible results.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/dbeae9d38c40e5c4742bd4ce3bc3eddf.jpg?v=1765062103\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec.jpg?v=1765062107\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/22c5068a8f4783079f93c42761aa9238.png?v=1765062111\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e4. L- Quad Enhance Filter (L-QEF) Gloable Price\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eUnit Price in USD dollars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2\" mounted\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e $199\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5. Packing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOuter Box: silver box\u003c\/p\u003e\n\u003cp\u003ePlastic Box: PP material\u003c\/p\u003e\n\u003cp\u003eLining: imported high pressure white EVA material\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/c656702f1ca52b7dc92d472bba4be081.jpg?v=1765062114\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e6. L- Quad Enhance Filter (L-QEF) Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eI. The Seven Sisters meet the Comet ©  Vincent Cheng (China Hong Kong)     \u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eThe seven sisters meet the Comet\u003cbr\u003eEquipment：\u003cbr\u003eDate \/Location :\u003cbr\u003e17-18, SEP, 2023\u003cbr\u003eDanXiaShan STARHOUSE, China（Bortle 4）\u003cbr\u003eCamera : ASI294MC Pro (cooled at 0C)\u003cbr\u003eGain : 120\u003cbr\u003eTelescope: William Optics RedCat 51 (250mm f4.9)\u003cbr\u003eFilter : Optolong L-QUAD ENHANCE 2-inch\u003cbr\u003eMount: iOptron SmartEQ PRO+\u003cbr\u003eGuide:  ASI120MM mini, ZWO OAG\u003cbr\u003econtrolled by ASIAIR plus\u003cbr\u003eExposure: 180s X 80frames\u003cbr\u003ew Dark Frames, Bias Frames, flat Frames\u003cbr\u003eprocess w PI,PS CC\u003cbr\u003eCredit: Vincent Cheng\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ab81cbde0345bb95f6e3c70c1211d265.jpg?v=1765062118\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eII. Double Cluster  ©Astrodoc Ron Brecher（Canada） \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThis image is a test of the new Optolong L-Quad Enhance Filter (LQEF), a light pollution filter for broadband photography. This test was conducted under a full Moon and moderate transparency – a tough test for any filter. For my first target I chose the Double Cluster to evaluate star colours and shapes. This filter performed well on these targets. I will test on a galaxy when the Moon is out of the sky.\u003c\/p\u003e\n\u003cp\u003eNGC 869 (right) and NGC 884 each contain hundreds of stars and are about 13 million years old (compared to 75-150 million years for the Pleiades). Lying about 7,500 light years away and a few hundred light years apart, they have a combined mass about 6,500 times our Sun’s. However, their combined halo is more than 20,000 solar masses. The clusters are moving towards us at a speed of about 40 km\/s.\u003c\/p\u003e\n\u003cp\u003eThese open clusters are bright enough that they were originally given star designations (h- and Chi Perseus). They are visible to the naked eye, appearing as an oval foggy patch in a dark sky. They look like sparkling white diamond dust in binoculars or a small telescope. \u003cbr\u003eTekkies:\u003cbr\u003eTakahashi FS-60CB scope with flattener at f\/6.2 and QHY367C Pro one-shot colour camera with Optolong L-Quad Enhance Filter.\u003c\/p\u003e\n\u003cp\u003eAcquisition and Paramount MX control with N.I.N.A.\u003c\/p\u003e\n\u003cp\u003eNo guiding All pre-processing and processing in PixInsight.\u003c\/p\u003e\n\u003cp\u003eAcquired from my SkyShed in Guelph on September 29, 2023. Average transparency and seeing, full Moon.\u003c\/p\u003e\n\u003cp\u003e42x5m chrominance = 3hr30m\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astrodoc.ca\/double-cluster-2023\/?fbclid=IwAR2n2qjMdmpycL8QjXDuig1IPnlKXcLZ5_sv4S0YFSkFczYpk5S47q7lTtE\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/683bb9bcfc4b10f1a169f16366e7a885.jpg?v=1765062121\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIII. LDN 1235 Shark Nebula  ©Andrea Maggi (Italy) \u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eLDN 1235 Shark Nebula \u003cbr\u003eTesting the new Optolong filter for colour cameras\u003cbr\u003eSharpstar 76PH telescope \u003cbr\u003eCamera ZWO ASI 2600MC\u003cbr\u003eOptolong filter L-Quad Enhance Filter (L-QEF)\u003cbr\u003e11 hours of exposure\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/49deb2c530aa611105c6ecea0d48fd6c.jpg?v=1765062125\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIV.  The globular star cluster (M92) © Tommaso Massimo Stella (Italy) \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThe globular star cluster (M92)\u003cbr\u003eThe performance of the filters is very good.\u003cbr\u003eDate: 2023-07-23\u003cbr\u003eLocation: Valle degli Ulivi (Taranto-Italy)\u003cbr\u003eSKY: SQM 19.85\u003cbr\u003eLights: 41x180s BIN2\u003cbr\u003eTelescope: Sky-Watcher 250\/1000 + GPU Coma Corrector\u003cbr\u003eCamera: Omegon veTEC 571C V4\u003cbr\u003eFilters: New Optolong Astronomy Filter broadband filter L-QEF\u003cbr\u003eMount: Sky-Watcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/fe6ac906ced83059b5b7679db589b355.png?v=1765062129\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eV. The Sculptor Galaxy © First Person View Astro (Frank Arapovic)  \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eHere is my latest edit of NGC253 also goes by the name of The Sculptor Galaxy or by the name The Silver Dollar Galaxy. It is estimated to be about 45,000 light years across and 11.4 million light years away from Earth.\u003c\/p\u003e\n\u003cp\u003eThis image was taken with the new Optolong Filter User L-Quad Enhance Filter. This filter is excellent. The first thing you notice and really stands out after you open up the package is the build quality of the filter, it is second to none. You can see that the manufacturing and QC process has been to the highest standard.\u003c\/p\u003e\n\u003cp\u003eBut as you can see in the image it's the results that truly matters and I have found that this filter is capable of doing what it states, providing excellent image quality in light polluted areas.\u003c\/p\u003e\n\u003cp\u003eProcessing the image was easy too. There are no halos around bright stars thus far. I have imaged other targets but with only a limited amount of subs, such as M17 and NGC2070, however with the limited time I have had on those targets it's shown to be promising.\u003c\/p\u003e\n\u003cp\u003eI am yet to image some more difficult targets such as The Orion Nebula but I am keen to do so ASAP.\u003c\/p\u003e\n\u003cp\u003eThe image was taken in a bortle 5 location with the moon out over two nights of the 4th and 5th of October 2023\u003c\/p\u003e\n\u003cp\u003eCelestron EdgeHD8 at f7\u003cbr\u003eZWO ASI2600MC Pro, gain 101, -10c\u003cbr\u003e154 x 180sec subs, cropped\u003cbr\u003e30 x darks\u003cbr\u003e30 x flats\u003cbr\u003e30 x flat darks\u003cbr\u003eStacked and Processed with PixInsight\u003c\/p\u003e\n\u003cp\u003eBortle 5, backyard Auckland, New Zealand\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ace6fa6a8881a5d85e9f87e9db1d1c3b.png?v=1765062132\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eVI. NGC7000 and the Pelican Nebula  © Shawn Nielsen (Canada)\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eNGC 7000 (left) and the Pelican Nebula (right) imaged with the new Optolong Quad enhance filter for OSC. \u003cbr\u003eAlso used, Starfield 60Q telescope, QHY268C camera and iOptron HEM15 strainwave mount. \u003cbr\u003e5hr 30min total. \u003cbr\u003eImaged under 80% Moon.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/836ffc71f86d80815dc32789f9f5844a.jpg?v=1765062136\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eVII. Shark nebula (LDN1235) © Matej Mihelčič （Slovenia） \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eShark nebula (LDN1235)\u003cbr\u003eOmegon 108Q@600m \u003cbr\u003eASI094MC\u003cbr\u003eOptolong L-Quad Enhance Filter (L-QEF) \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/974bcc3bbe7d4033d39b8a142085e4ae.png?v=1765062140\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":44337200627931,"sku":"Optolong L-QEF 2\"","price":278.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-l-quad-enhance-filter-l-qef-quad-bandpass-light-pollution-suppression-filter-40096821674203.jpg?v=1697574732"},{"product_id":"optolong-1-25-if-ir-uv-blocking-filter-on-kg3-glass-op-kg3-1","title":"Optolong IF\/IR\/UV blocking filter on KG3 glass","description":"\u003cp\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cp\u003eThe Optolong IF\/IR\/UV Blocking Filter on KG3 Glass provides superior protection by completely blocking IR radiation up to 5000 nm. This makes it an excellent complement to neutral filters that do not block UV and IR radiation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete IR Blocking:\u003c\/strong\u003e Blocks IR radiation entirely up to 5000 nm, offering the best possible protection against heat radiation from the sun.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Safety:\u003c\/strong\u003e Ideal for use with lens solar filters or Herschel prisms to ensure the highest safety standards for solar observation. Note: This filter is NOT a substitute for a primary solar filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Construction:\u003c\/strong\u003e Made with KG3 glass for durability and reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e This filter should only be used as a supplementary protection in conjunction with a proper lens solar filter or Herschel prism. It is NOT a standalone solution for solar observation and must not be used without adequate primary solar protection.\u003c\/p\u003e\n\u003cp\u003eElevate your observational safety and enhance your viewing experience with the Optolong IF\/IR\/UV Blocking Filter on KG3 Glass.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"text-decoration: underline;\"\u003eSpecifications \u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable class=\"tdata\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cb\u003eType\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003eInfrared and UV blocking filter (up to 5000 nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cb\u003eCoating\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003eMulti-coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cb\u003eMount\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003ealuminum mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cb\u003eConnection\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003e1.25\" or 2\" filter thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":47536846405851,"sku":"OP-KG3-1.25\"","price":123.0,"currency_code":"CAD","in_stock":false},{"title":"2\"","offer_id":47536846438619,"sku":"OP-KG3-2\"","price":159.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-1-25-if-ir-uv-blocking-filter-on-kg3-glass-op-kg3-1-41778871173339.jpg?v=1726327378"},{"product_id":"optolong-l-para-l-parallels-filter-2-mounted-opt-l-para-2","title":"Optolong L-Para (L-Parallels) Filter 2\" Mounted - OPT-L-PARA-2","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e1.  Optolong L-Para(L-Parallels)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Para is a brand new dual narrowband 10nm light pollution filter. The FWHM of L-Para is 10nm for OIII (500.7nm) and H-Alpha (656.3nm) respectively. The transmittance of nebulae emission lines at are both greater than 85% in system with focal ratios of F2 and above. It effectively filters out mercury lamp, sodium lamp, and LED light pollution emission lines. At the same time, it has excellent contrast and anti-halo characteristics, allowing you to capture detailed and vivid nebula images. L-Para is suitable for both normal optical systems and fast optical systems, such as RASA and Hyperstar systems. Even when light is incident at an oblique angle, it can still maintain high transmission rates to provide you with a clear and precise shooting experience.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBroad Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA dual narrowband filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLight Pollution Resistance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEffectively cuts off emission lines from mercury lamps, sodium lamps, LEDs, and other light pollution sources, making it applicable to Bortle Scale1- 7 dark skies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Transmission Rate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, resulting in higher imaging efficiency.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eExcellent Contrast:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe high transmittance of nebula emission lines (OIII \u0026amp; Ha) combined with deep cut-off of light pollution bands significantly improves image contrast and detail richness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAnti-Halo Characteristics:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe design has undergone several round of optimizations and many times of repeated testing ,resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e2.Spectrum\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAccording to the characteristics of the emission lines of celestial bodies and light pollution, as well as the characteristics of the normal telescope and fast ratio imaging system, L-Para has been maintaining high transmittance at OIII and Ha while blocking light pollution emission lines.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/9b96104f725faacefa9ded926bfab8da.png?v=1765062436\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/2700143340459da0e3aa3e900c9c60f4.png?v=1765062439\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/ec92b95b51a57afdfb563adfcf710c88.png?v=1765062442\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_51cbfb2c-e380-48cb-b0db-4e89fd0075fb.jpg?v=1765062446\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e5. Packing\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: silver box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: imported high pressure white EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/e822f3dcce3aec3b4f0c2be188f05c41.png?v=1765062450\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e6. L-Para Filter Performance\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eI. Halo Testing\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNGC 7000\/Star level 1.24\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e68mm F3.9+ASI 6200MC、Single300s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/6aa22d7117101f71c37596aff6970707.png?v=1765062453\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eII. Halo Testing \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIC 434 The Horse Head Nebulae \/1.74 level\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e68mm F3.9+ASI 6200MC、Single 300s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/8323ef24348b4c584cb299bf620bda69.png?v=1765062457\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIII. Heart Nebula\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSharpstar 76+2600MC + Optolong L-Para\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCredit: Andrea Maggi\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/7ef01e590ef6beb5819cf9b2b7734e59.png?v=1765062461\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIV. Valle degli Ulivi \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLights: 38x600s APO 102\/570mm + ASI 2600mc + AZEQ6 GT+ Optolong L-Para\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCredit: Tommaso Massimo Stella\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/100ffade46b9e69b02c908c22085a84e.png?v=1765062465\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46400112230619,"sku":"OPT-L-PARA-2","price":368.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-l-para-l-parallels-filter-2-mounted-opt-l-para-2-43834073841883.png?v=1736306578"},{"product_id":"optolong-l1-dual-combo-set-l-quad-enhance-and-l-para","title":"Optolong 2\" L1 Dual - Combo Set (L-Quad Enhance and L-Para) - OPT-L1-DUAL","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e1. Introduction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL1 Dual -Combo Set includes：1* \u003cstrong\u003e\u003cu\u003eL-Quad Enhance Filter\u003c\/u\u003e\u003c\/strong\u003e \u0026amp; 1* \u003cstrong\u003e\u003cu\u003eL-Para\u003c\/u\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cu\u003eL-Quad Enhance Filter: \u003c\/u\u003e\u003c\/strong\u003eQuad band-pass broadband filter ,  This filter provides better color balance while improving resistance of light pollution. It is suitable for a wide range of imaging targets, including continuous spectrum objects (RGB) such as nebulae, galaxies, and star clusters. This filter maximizes the preservation of RGB color balance in broadband spectrum targets like nebulae and galaxies, effectively improving contrast and detail to render subjects more vivid and three-dimensional.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eL-Para: \u003c\/strong\u003e\u003c\/u\u003eA dual narrowband 10nm filter  ,in systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, with excellent contrast and Anti-Halo characteristics . This filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes. Ideal for capturing Hα \u0026amp; OIII signals in celestial objects, this filter enhances image contrast and reveals richer details in Hα \u0026amp; OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e1+1\u0026gt;2 features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e“Broadband + Narrowband” synergy engineered for precision and colour fidelity, achieves precise signal capture and color optimization for astrophotography\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e►\u003cstrong\u003eL-Quad Enhance Filter\u003c\/strong\u003e: Quad band-pass broadband filter captures the RGB signals of celestial targets\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e►\u003cstrong\u003e\u003cu\u003eL-Para\u003c\/u\u003e\u003c\/strong\u003e : Dual narrowband 10nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionized gas in deep-sky objects. After post-processing, photographers can effortlessly obtain fused images combining RGB with Hα \u0026amp; OIII data. This \"Broadband-Narrowband Synergy\" solution delivers more vibrant color rendition while accentuating subtle signal details, unlocking innovative approaches for astrophotography and enhancing the creative possibilities of color camera imaging. It pioneers new artistic dimensions, transforming the deep-sky photography process into a more technically engaging and visually rewarding experience.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e2. Coating Technology\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/da48f35d2165da6c12721396f4f6a843.png?v=1765062164\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/a4eb920c36df3dbbac7044f6e4d6dacc.png?v=1765062168\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e3. L1 Dual -Combo Set Gloable Price\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUnit Price in USD dollars\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e2\" mounted\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e $399\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e4. Packing: two filters in one box and package\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: silver box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: imported high pressure white EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/2344669e2ce8532c4f1c276c2b2b577c.jpg?v=1765062172\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e5. Optolong L1 Dual-Combo Set Performance\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eI. The Lagoon Nebula M8  @Gianni Lacroce\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Lagoon Nebula M8 is a diffuse nebula in the constellation Sagittarius. It is one of the brightest regions in the sky and is visible to the naked eye on clear, dark nights.\u003cbr\u003eOne of the main features of the Lagoon Nebula is the presence of small black spots known as Bok globules, which are protostellar clouds.\u003cbr\u003eThe brightest region of the nebula, at the centre of the Lagoon, is known as the Hourglass Nebula and is a region of intense star formation.\u003cbr\u003eThe Trifid Nebula M20 on the right is a well-known star-forming region and is made up of three different types of cosmic clouds: reddish emission nebulae, blue reflection nebulae (produced by dust reflecting starlight), and dark nebulae, including the central one divided into three dense bands of dust, hence the name Trifid.\u003cbr\u003eNGC 6559 on the left features both red emission and bluish reflection regions.\u003cbr\u003eThis image is the result of two shots, one broadband and one narrowband, for a total of almost 30 hours, a combination of two l-quef and l-para filters to amplify the signal and detail of the nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/e3fcc7d9e5aed0c27d3e8025e237b603.jpg?v=1765062175\" alt=\"\"\u003e\u003c\/span\u003e\u003cspan\u003eImaging Telescope: Askar fra600 reduced to f3.9\u003cbr\u003eImaging Camera: ZWO ASI2600MC Duo\u003cbr\u003eMount: ZWO AM5\u003cbr\u003eOptolong L-Para and L-QEF filters\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e►Here are the unfiltered frame, the L-QEF filtered frame, and the L-Para filtered frame.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/a846f2dde979c4da6bb24d459032e066.jpg?v=1765062179\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eII. IC434 Horsehead Nebula B33 Flame Nebula Ngc2024 @Gianni Lacroce\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIC 434 (Horsehead Nebula) is one of the most popular winter celestial targets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis nebula complex consists of B33, the Flame Nebula (NGC 2024), and its massive hydrogen wave structure, located in the Orion constellation near the bright star Alnitak in Orion's , approximately 1,500 light-years from Earth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis astro-photo was captured using a strategic two-filter approach: The L-QEF  broadband filter collected detailed RGB continuum signals from the Horsehead Nebula (a continuous spectrum target rich in Hα emissions) The L-Para dual-narrowband filter specifically enhanced the  (Hα) structure Through precise  blending, these specialized filters worked synergistically to produce this visually striking rendition of the Horsehead Nebula~\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/24faa343dd866a5895f6e32a9d257812.jpg?v=1765062183\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImaging telescope: Askar fra600 reduced to f3.9\u003cbr\u003eImaging Camera: ZWO ASI2600MC Duo\u003cbr\u003eMount: ZWO AM5\u003cbr\u003eFilters: Optolong filter L-QEF, L-Para\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIII. NGC 2237_ROSETTA HOO @ Mirko Tondinelli \u0026amp; Astronomia Astris\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNGC 2237_ROSETTA HOO After processing the Rosetta in Hubble Palette\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eI have created a two-colour version with the data collected by my telescope combined with those of my astrophotographer friend Riccardo Pacini astrophotography . The Rosetta Nebula (also known by its catalogue numbers NGC 2237 and C 49) is a large, roughly circular H II region located at the edge of a giant molecular cloud in the constellation Unicorn.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe nebula has an angular diameter of 1.3° and lies at a distance of 1600 parsecs (about 5200 light years) from the Solar System; it is about 100 light years in size. At the centre of the Rosetta Nebula is a bright open cluster known as NGC 2244.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/d8e971448d6a179935ff947f8b63dd2a.jpg?v=1765062186\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTecnosky 90\/540 FPL55 OWL Omegon veTEC 571 C Sky-Watcher EQ6 Pro\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFILTERS: Optolong L-Para 10nm 2\", Optolong L-QEF 2\" ( for stars)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDATES: 13 February 2024, 27 February 2025\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLIGHT: Optolong L-Para 10nm 2\": 30×300,″(2h 30′) Optolong L-QEF 2\": 30×180,″(1h 30′) for stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIntegration: 4 hours Explore scientific Fdc100 Asi 294 mm Starizona flattener Integration with Ha and O3 filters for a total of about 15 hours.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWest Virginia( USA)@Mirko Tondinelli \u0026amp; Astronomia Astris\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCredit: Mirko Tondinelli \u0026amp; Astronomia Astris\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47473205739739,"sku":"OPT-L1-DUAL","price":558.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-l1-dual-combo-set-l-quad-enhance-and-l-para-opt-l1-dual-1186024582.jpg?v=1755550633"},{"product_id":"optolong-l2-dual-combo-set-l-extreme-and-l-synergy-opt-l2-dual","title":"Optolong 2\" L2 Dual Combo Set (L-eXtreme and L-Synergy) - OPT-L2-DUAL","description":"\u003ch4\u003e\n\u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: rgb(255, 42, 0); text-decoration: underline;\"\u003e\u003cstrong\u003ePromotional price for official launch, offer valid Sept 25, 2025- Oct 25, 2025\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eWhat is  L2 Dual-Combo Set?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eL2 Dual-Combo Set includes two premium filters: one L-eXtreme and one L-Synergy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL-eXtreme: The L-eXtreme is a dual-narrowband filter (OIII-7nm \u0026amp; Ha-7nm) designed to exclusively transmit the key nebula emission lines of OIII (500.7nm) and Hα (656.3nm). By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and Hα elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL-Synergy：The L-Synergy is a dual-narrowband filter (OIII-7nm \u0026amp; SII-7nm) that guarantees high transmission for both the SII (672.4nm) and OIII (500.7nm) spectral lines, while offering exceptional out-of-band rejection for all other wavelengths. By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and SII elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e Why is L2 Dual-Combo Set? (Advantages)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe L2 Dual-Combo Set is engineered to unleash the power of Hubble Palette imaging for color camera users, supporting telescope systems as fast as F3.3, and above ( slower system).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTailored specifically for color camera astrophotographers, this set includes two premium filters: OIII \u0026amp; Hα (L-eXtreme),OIII \u0026amp; SII (L-Synergy).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis innovative combination breaks through the traditional limitations of narrowband imaging with color cameras. Without the need to switch to a monochrome camera or invest in an expensive SHO three-filter set, users can achieve stunning Hubble Palette images at a fraction of the cost and complexity.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe core appeal of this combination design lies in lowering barriers and expanding possibilities for colour camera users: it preserves the equipment advantages of colour cameras while enabling users to unlock “Hubble-like” creative capabilities at minimal cost through minimalist filter combination. Simultaneously, it offers greater flexibility for astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhether capturing nebular detail or reproducing deep-sky colours, this combination enables richer creative expression, truly unlocking the full potential of colour cameras in deep-sky photography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eBased on the characteristics of celestial emission lines and light pollution emission lines, the L2 Dual-Combo Set preserves the distinctive colours of nebulae in OIII, Hα, and SII while filtering out the vast majority of light pollution. Specifically designed and optically optimized, its transmission profile is as follows:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/19ce3d5664886f96373832d4be8e8830.png?v=1765062191\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e*We will continue to optimize the product based on test results. This curve does not represent final product specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_02386b5e-2c7a-4196-ba4a-8ce39e28b4a1.jpg?v=1765062195\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e Coating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMulti-layers anti-reflection coating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable align=\"center\" border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"width: 99.9589%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 54.9591%;\"\u003e\u003cspan\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 45.0834%;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 54.9591%;\"\u003e\u003cspan\u003e2\" (M48×0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 45.0834%;\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e L2 Dual-Combo Set Packing Style\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: Gift set packing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: imported high pressure BLACK EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/b2fda500625ec7b632079fa3facd585b.jpg?v=1765062198\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eL2 Dual-Combo Set Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch5\u003e\u003cspan\u003e\u003cstrong\u003eI. \u003c\/strong\u003e\u003cstrong\u003eNGC 7000 in SHO\u003c\/strong\u003e\u003cstrong\u003e©RONALD BRECHER\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h5\u003e\n\u003cp\u003e\u003cspan\u003eNGC 7000 (also called the North America Nebula) dominates the left side of this image, and NGC 5070 (the Pelican Nebula) is to the right. These clouds of gas are part of a huge complex of emission nebulae lying about 1,600 light years away in northern Cygnus. With an apparent magnitude (brightness) of 4, in theory this object is visible to the naked eye, even though its light is very spread out. I have seen it with my naked eye and with low power binoculars in dark skies north of where I live. It looks like a faintly hazy, irregular patch of grey.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eI have previously imaged this region in a wide field and at higher resolution. For example, you can find images of the \u003ca href=\"https:\/\/astrodoc.ca\/southern-ngc7000-the-cygnus-wall\/\"\u003eCygnus Wall \u003c\/a\u003e(the “Central America” region) and \u003ca href=\"https:\/\/astrodoc.ca\/ic5070-and-ic5067-the-pelican-nebula\/\"\u003ethe Pelican\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll but one of my prior images has been in natural broadband colour, dominated by red emissions of hydrogen. For this image I used two Optolong dual-narrowband filters designed for colour cameras. The Optolong L-eXtreme passes hydrogen and oxygen emissions; the brand-new L-Synergy filter passes sulphur and oxygen emissions. I combined the data from the two filters assigning sulphur to red, hydrogen to green, and oxygen to blue, making the traditional Hubble Palette. As you can see from the image, the filters worked great. It will be available for purchase soon. This is the first narrowband image made with the 70mm f\/7 Sky-Watcher Esprit EDX refractor. Sky-Watcher hopes to have them available to buy by the end of 2025. Here is some preliminary information about the new Esprit EDX line.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/astrodoc.ca\/ngc-7000-sho\/\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/eb5a201a5a2700e7b4e509292cffabd9.jpg?v=1765062202\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTekkies\u003c\/strong\u003e:\u003cbr\u003eAcquisition, focusing, and control of Paramount MX mount and other equipment with N.I.N.A. and TheSkyX. Unguided. Focus with Primalucelab Sesto Senso 2 on the Sky-Watcher stock focuser. Equipment control with Primalucelab Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph. Acquired under average transparency and seeing and moderate to strong moonlight from August 31 – September 8, 2025.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSky-Watcher Esprit 70 EDX refractor, QHY367C Pro camera.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-Synergy Filter: 147 x 5m = 11hr 50m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eL-eXtreme Filter: 140 x 5m = 11hr 40m\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTotal: 23hr 30m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eData Reduction and Linear Processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePreprocessing: The WeightedBatchPreProcessing script was used to perform calibration, cosmetic correction, weighting, registration, local normalization, integration and Drizzle integration of all frames (Fast Drizzle, Scale=2x, Drop Shrink=0.9).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGradient Removal: DynamicBackgroundExtraction was applied to the two masters (L-Synergy = SOO; L-eXtreme = HOO).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSHO Master Creation: PixelMath was used to create an SHO using the equations:\u003cbr\u003eR=SOO[0]\u003cbr\u003eG=HOO[0]\u003cbr\u003eB=0.25 x (SOO[1] + SOO[2]+HOO[1] + HOO[2]\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDeconvolution: BlurXterminator was applied to the SHO image using an automatic PSF, star sharpening set to 0.10, and “Correct First” selected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy \u003ca href=\"https:\/\/astrodoc.ca\/author\/astrodoc\/\" title=\"Posts by Ron Brecher\"\u003eRon Brecher\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47628761071835,"sku":"OPT-L2-DUAL","price":752.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-2-l2-dual-combo-set-l-extreme-and-l-synergy-opt-l2-dual-1194695733.jpg?v=1758819566"},{"product_id":"optolong-2-l-synergy-7nm-dual-narrowband-filter","title":"Optolong 2\" L-Synergy 7nm Dual Narrowband Filter (SII and O-III)","description":"\u003cp\u003eOptolong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments. it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eWhy do we make a L-Synergy filter?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe core innovation of L-Synergy filters lies not in a single functional breakthrough, but rather in the precise combination of traditional dual-narrowband (Ha \u0026amp; OIII) technology—specifically tailored for color camera users. By adopting a dual-filter setup of \"Ha \u0026amp; OIII + SII \u0026amp; OIII\", it overcomes the inherent limitations of color cameras in narrowband astrophotography. With L-Synergy, users can achieve Hubble Palette-style deep-sky images comparable to those captured by monochrome SHO (SII\/Ha\/OIII) systems—without switching to a monochrome camera or purchasing additional SHO filters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis solution delivers high-quality results with minimal investment, making professional-level narrowband imaging accessible to all.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eOptolong L-Synergy \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter years of technical refinement, it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy's advantage lies in its selective transmission of only the nebula emission lines OIII (500.7nm) and SII (672.4nm), while blocking all other light-polluting emission lines. This ensures that only the signals from oxygen and sulfur elements are captured during imaging, resulting in a darker sky background and significantly enhanced contrast and signal-to-noise ratio (SNR) between nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEven in heavily light-polluted areas, this filter selectively transmits nebula emission lines while filtering out light pollution, ultimately eliminating its impact on astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eBy analyzing the spectral characteristics of both celestial emission lines and light pollution, L-Synergy selectively preserves the SII and OIII nebula colors while filtering out the majority of light pollution. Specifically designed and optically optimized, L-Synergy maintains consistently high transmission across both SII and OIII bands. This ensures users can precisely capture the target nebula emissions, delivering optimal astrophotography results.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/2b383de22cb607feeca255a89118e02d.png?v=1765062145\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e*We will continue to optimize the product based on test results. This curve does not represent final product specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/0ff2d7f395c427aa390ff53daf333cec_0a07274f-e721-4f29-8530-da6b9e69a7bf.jpg?v=1765062148\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMulti-layers anti-reflection coating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable align=\"center\" border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"width: 99.9589%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 77.3861%;\"\u003e\u003cstrong\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 22.6564%;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 77.3861%;\"\u003e\u003cspan\u003e2\" (M48×0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 22.6564%;\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e Packing Style\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: silver box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: imported high pressure white EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/cdc86e4766f54004523d2fa515aec788.jpg?v=1765062151\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e6. L-Synergy Filter Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWR134 in the Cygnus constellation © Gianni Lacroce\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest with the new Optolong L-Synergy filter, a 7nm S2 O3 dual-band filter, and \u003cu\u003eI have to say I really liked it.\u003c\/u\u003e\u003cbr\u003eI chose to photograph WR134 in the constellation Cygnus.\u003cbr\u003eHaving shot in monochrome, which usually results in a significant amount of signal with an H-alpha filter, the O3 is there, but sometimes I have to integrate a lot to bring it out; the S2 isn't there at all. So I thought, ‘There won't be all that much signal; to take a decent photo, I'll have to integrate a lot,’ and that's why I took 200 5-minute shots.\u003cbr\u003eOnce I'd processed the photo, I found it came out of the WBPP \u003cu\u003ewithout gradients or halos\u003c\/u\u003e, but above all, bi-color, meaning full of S2 and lots and lots of O3, and I find this wonderful. I didn't have to do anything else in processing except stretch the image, balance contrast, highlights, and tones to customize it a bit, but in the end, it was already like this in the raw file.\u003cbr\u003e\u003cu\u003eThis filter greatly simplifies post-production.\u003c\/u\u003e\u003cbr\u003eI'll also show you the Starless Nebula to help you understand the signal and the O3 it produces.\u003cbr\u003eMore shots of this new filter will follow soon.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eEQUIPMENT\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eImaging Telescope: Newton Tecnosky Carbon 200\u003cbr\u003eImaging Camera: ZWO ASI2600MC duo  \u003cbr\u003eMount: ZWO AM5\u003cbr\u003eOptolong \u003cu\u003e\u003cstrong\u003eL-Synergy\u003c\/strong\u003e\u003c\/u\u003e filters\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003ePHOTOS\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003etemp 0 with dark, flat and dark-flat\u003cbr\u003e200 x 300s  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePROCESSING\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePixinsight\u003cbr\u003ePhotoshop\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/3dc76bfb5842d4edd3a1bc3b42921500.jpg?v=1765062155\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/e0ca57831dd087abad04f33706aad8e5.jpg?v=1765062158\"\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47628852330715,"sku":"Optolong L-Synergy 2\"","price":431.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/optolong-filter-optolong-2-l-synergy-7nm-dual-narrowband-filter-sii-and-o-iii-1194695727.jpg?v=1758819448"}],"url":"https:\/\/telescopescanada.ca\/collections\/optolong-master-collection.oembed?page=2","provider":"Telescopes Canada","version":"1.0","type":"link"}