{"product_id":"baader-c2-swan-band-filter-15nm-oiii-parallel-fswan","title":"Baader C2 Swan-Band Filter (15nm) OIII Parallel - FSWAN","description":"\u003cul\u003e\n\u003cli\u003e1¼\" Comet filter for the two brightest C2 emission lines at 511 and 514nm (called \"Swan-Band\") in the gas tail and gas plume of comets, respectively, FWHM 15nm with 1¼\" (M28,5mm) filter thread\u003c\/li\u003e\n\u003cli\u003e2\" Comet filter for the two brightest C2 emission lines at 511 and 514nm (called \"Swan-Band\") in the gas tail and gas plume of comets, respectively, FWHM 15nm with 2\" (M48) filter thread\u003cmeta charset=\"utf-8\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocks the adjacent OIII line, which does not predominantly occur in the tail of comets\u003c\/li\u003e\n\u003cli\u003eCMOS optimized for increased contrast\u003c\/li\u003e\n\u003cli\u003eFront-Reflex-Blocker™ hard coated and Plane-optically polished – with sealed coating edges (\u003cstrong\u003e\u003c\/strong\u003e\u003ca href=\"https:\/\/www.baader-planetarium.com\/en\/blog\/life-coat\" class=\"ajax-popup\" target=\"_blank\"\u003eLife-Coat™\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eContrast gain for comet hunters\u003c\/h2\u003e\n\u003cp\u003eThe Baader C2 SWAN-Band-Filter with\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e? 15 nm Half-Band-Width isolates the two C2 lines at 511 and 514nm.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThese two emission lines, named Swan bands after their discoverer, dominate the spectrum of a comet's gas tail in the visible range. The filter allows only the light from the two carbon bands to pass through and, among other things, blocks the ubiquitous stray light, similar to a nebula filter in deep-sky observation. Structures in the gas tail thus become clearer even under good observing conditions. At the same time,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eit completely blocks the OIII line at 501nm and below\u003c\/strong\u003e, which other Swan-Band filters allow to pass. This allows for even higher contrast, and comets with gas tails can be distinguished even better from those dominated by a dust tail (and where a SWAN filter provides only a small contrast enhancement). For ambitious comet observers, a SWAN filter is part of the basic equipment.\u003c\/p\u003e\n\u003cp\u003eJust in time for the introduction of the new C2 Swan-Band filter, a bright comet,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ecomet C\/2022 E3 (ZTF)\u003c\/strong\u003e, offered itself as a test object. Our customer Andreas Bringmann was one of our first testers - see more under\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.baader-planetarium.com\/en\/c2-swan-band-filter-(15nm-)-o-iii-parallel-comet-filter.html\/#rw_1201\"\u003eTAB Review\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThis image was taken from the big city and with an almost full moon. You can clearly see the amount of \"doubly ionized carbon\" (the carbon excited to glow radiates only in the wavelengths 511 nm and 514 nm ) emitted by the comet. The filter shows the complete extension of the ion cloud around a comet:\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/QgT9pu_nMo1f_16536x0_iASIrZ5T_3MB_db20b5b3-ed2a-4971-8f7a-01e5b55bcf14.jpg?v=1765044700\" class=\"image-popup\" target=\"_blank\"\u003e\u003cimg width=\"800\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/QgT9pu_nMo1f_16536x0_iASIrZ5T_3MB_db20b5b3-ed2a-4971-8f7a-01e5b55bcf14.jpg?v=1765044700?auto=webp\u0026amp;format=pjpg\u0026amp;quality=85\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv class=\"imageCaption\"\u003eC-2022E3_ZTF passes Hassaleh in Auriga (Baader C2 Swan-Band 15nm), imaged with Celestron EdgeHD 11\", Takahashi FSQ-85ED | Moravian Instruments G3-16200 MK I, ZWO ASI6200MM Pro | 10Micron GM3000 HPS \u0026amp; Baader C2 Swand-Bad Filter, 2\" (15nm), © A. Bringmann\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eThe Baader SWAN-Filter has got all the advantages of the CMOS-optimized Baader filters:\u003c\/h3\u003e\n\u003cul class=\"features\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eIncreased contrast\u003c\/strong\u003e, matched for typical CMOS quantum efficiency and s\/n ratio\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eReflex-Blocker\u003csup\u003e™\u003c\/sup\u003e\u003cspan\u003e \u003c\/span\u003ecoatings\u003c\/strong\u003e, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eIdentical filter thickness\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto existing standards, with utmost care for remaining Par focal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eBlackened edges all around\u003c\/strong\u003e, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter, making additional front-masks obsolete\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eEach filter coated individually\u003c\/strong\u003e, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed,\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.baader-planetarium.com\/en\/blog\/information-about-baader-filters-and-filtercells\/\"\u003eread more\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/www.baader-planetarium.com\/en\/blog\/life-coat\" target=\"_blank\"\u003eLife-Coat™\u003c\/a\u003e:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eevermore hard coatings to enable a non-aging coating for life – even in a most adverse environment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan class=\"productFullDetail-productDetailsSectionTitle-o92 hidden md_block md_uppercase md_text-[1.125rem] md_mt-10 md_mb-8 lg_text-[1.375rem]\"\u003eSpecifications:\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003ch3 class=\"productFullDetail-productSpecificationsProductName-2g0 text-base font-bold mb-4 lg_text-lg\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e1¼\" C2 Swan-Band Filter (15nm) – O III parallel\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"read-more-root-URo\"\u003e\n\u003cdiv class=\"read-more-containerOpened-yJY read-more-container-sMW read-more-containerDefault-GDH overflow-hidden relative\"\u003e\n\u003cdiv class=\"undefined global-readmore-innercontainer\"\u003e\n\u003cdiv class=\"customAttributes-root-MXb\"\u003e\n\u003cdiv\u003e\n\u003cul class=\"customAttributes-list-qDg rounded\"\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eSKU: 2961860\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"multiselect-label-g4u font-bold inline-block mr-2\"\u003eAR-Coating: dielectrically coated, Plane-optically polished\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eCWL (Central Wavelength): 513 nm (for the C2 lines at 511 and 514nm)\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eEAN Code: 4047825054128\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eFilter mounted: Mounted (LPFC 6mm)\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eFilter shape: round\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eFilter size: 1 25 inch\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"textarea-label-XIL font-bold inline-block mr-2\"\u003eFilter Thickness (without cell): 2 mm\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"multiselect-label-g4u font-bold inline-block mr-2\"\u003eFilter Usage: Gas evolution of comets, O-III-paralel Imaging, Contrast Enhancement\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eHBW (Half bandwidth): ? 15nm\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eManufacturer: Baader Planetarium\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eNet weight (kg): 0.01\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eSingle or Set?: Single Filter\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eTransmission Range: ? 505 – 520 nm\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"multiselect-label-g4u font-bold inline-block mr-2\"\u003eType of Filter: Band-pass\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 class=\"productFullDetail-productSpecificationsProductName-2g0 text-base font-bold mb-4 lg_text-lg\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e2\" C2 Swan-Band Filter (15nm) – O III parallel\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"read-more-root-URo\"\u003e\n\u003cdiv class=\"read-more-containerOpened-yJY read-more-container-sMW read-more-containerDefault-GDH overflow-hidden relative\"\u003e\n\u003cdiv class=\"undefined global-readmore-innercontainer\"\u003e\n\u003cdiv class=\"customAttributes-root-MXb\"\u003e\n\u003cdiv\u003e\n\u003cul class=\"customAttributes-list-qDg rounded\"\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eSKU: 2961863\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"multiselect-label-g4u font-bold inline-block mr-2\"\u003eAR-Coating: dielectrically coated, Plane-optically polished\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eCWL (Central Wavelength): 513 nm (for the C2 lines at 511 and 514nm)\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eEAN Code: 4047825054135\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eFilter mounted: Mounted (LPFC 6mm)\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eFilter shape: round\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eFilter size: 2 inch\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"textarea-label-XIL font-bold inline-block mr-2\"\u003eFilter Thickness (without cell): 2 mm\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"multiselect-label-g4u font-bold inline-block mr-2\"\u003eFilter Usage: Gas evolution of comets, O-III-paralel Imaging, Contrast Enhancement\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eHBW (Half bandwidth): ? 15nm\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eManufacturer: Baader Planetarium\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eNet weight (kg): 0.01\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"select-label-3lv font-bold inline-block mr-2\"\u003eSingle or Set?: Single Filter\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"text-label-o47 font-bold inline-block mr-2\"\u003eTransmission Range: ? 505 – 520 nm\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"customAttributes-listItem-3fg border-solid border-b flex items-start min-h-[3rem]\"\u003e\n\u003cdiv class=\"multiselect-label-g4u font-bold inline-block mr-2\"\u003eType of Filter: Band-pass\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\"","offer_id":46325811544283,"sku":"2961860","price":116.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":46325811577051,"sku":"2961863","price":232.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/baader-planetarium-accessory-2-baader-c2-swan-band-filter-15nm-oiii-parallel-fswan-43530303209691.webp?v=1754512303","url":"https:\/\/telescopescanada.ca\/products\/baader-c2-swan-band-filter-15nm-oiii-parallel-fswan","provider":"Telescopes Canada","version":"1.0","type":"link"}