{"product_id":"open-box-celestron-11-rowe-ackermann-schmidt-astrograph-rasa-11-optical-tube-assembly-cge-dovetail-91076","title":"Open Box - Celestron 11\" Rowe-Ackermann Schmidt Astrograph (RASA 11) Optical Tube Assembly (CGE Dovetail) - 91076","description":"\u003cp\u003e\u003cstrong\u003eThis is an open box item.  It has been inspected and is in \"As New\" condition.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch4\u003eHighlights\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFast, wide-field 11 f\/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature\u003c\/li\u003e\n\u003cli\u003eLarge 43.3mm optimized image circle maintains pinpoint stars to the far corners of even the largest astro imaging sensors, while the usable field extends even further to 52mm for larger format sensors\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eNew Ultra-Stable Focus System (USFS)\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003eminimizes focus shift and mirror flop\u003c\/li\u003e\n\u003cli\u003eIntegrated air-cooling system features a quiet, high-output 12V MagLev fan and vents with mesh filters to prevent dust ingress\u003c\/li\u003e\n\u003cli\u003eCommon camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR cameras\u003c\/li\u003e\n\u003cli\u003eRASA scopes are for imaging only and cannot be used for visual observation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCapturing impressive deep-sky astro images is easier than ever with Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) V2, the perfect companion to today's top DSLR or astronomical CCD cameras. This fast, wide-field f\/2.2 system allows for shorter exposure times compared to traditional f\/10 astro imaging, without sacrificing resolution. Because shorter sub-exposure times are possible, your equatorial mount won't need to accurately track over extended periods. The short focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required.\u003c\/p\u003e\n\u003cp\u003eRASA 11 V2 builds on the legacy of Celestron's Schmidt Cameras, which allowed astrophotographers to produce images with much shorter exposure times on film in the 1970s.\u003c\/p\u003e\n\u003cp\u003eToday, with CCD sensor sizes as large as film or larger, the RASA 11 V2 offers a 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent.\u003c\/p\u003e\n\u003cp\u003eCombine this large image circle with a focal length of just 620mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptical Performance\u003c\/strong\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eThe RASA 11 V2 features optics with 4-element rare-earth glass for images free of false color and aberrations like coma and field curvature. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range-or even that of a much more expensive instrument. The design also provides minimal vignetting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced Features\u003c\/strong\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eRASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). At the heart of this system is a precision linear ball bearing. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). The integrated 12V DC MagLev fan reduces cool-down time and provides optimal airflow through the dust filtered optical tube.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astro imaging system, every component of the RASA 11 V2 is optimized for peak performance with DSLR and astronomical CCD cameras. Down to the thickness of the glass used in the included fully-multi-coated optical window or optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly. \u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eDovetail CGE bars on the top of the optical tube provides a connection for use of optional accessories like a guide scope.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003eUnique Optical Design\u003c\/h4\u003e\n\u003cp\u003eRASA's optical design is patented (US 2016\/0299331 A1). The design consists of a Schmidt corrector, primary mirror, lens group, and optical window. The lens group contains 4 elements and utilizes rare-earth elements. Unlike many telescopes that only perform well over the visible spectrum (400-700nm), the 8 RASA's optics are designed to perform over a wider spectral range, from 390-800nm. This allows more of the light emitted from the astronomical object to be sharply focused in the image. With many imaging systems, adding an extra piece of flat glass such as a filter does not change optical performance. However, that is not the case with super-fast optical systems like the RASA. Our engineers addressed this by designing the RASA with a removable optical window, so you can maintain peak optical performance if a filter is added or if a camera has its own optical window. Celestron offers a Light Pollution Imaging Filter designed specifically for the 8 RASA, which mounts in place of the optical window. All refractive optical surfaces are coated with StarBright XLT coatings, while the primary mirror uses enhanced aluminum coatings. This maintains high light transmission through the entire optical system. When compared with Hyperstar SCT systems, the RASA 8 provides better optical performance and field illumination.\u003c\/p\u003e\n\u003cdiv class=\"js-video video-wrap\" data-videoid=\"srgOjn3sqV8\"\u003e\n\u003cdiv class=\"video-frame\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/srgOjn3sqV8?enablejsapi=1\u0026amp;origin=https%3A%2F%2Fwww.celestron.com\" data-gtm-yt-inspected-2574542_66=\"true\" id=\"49246879\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv class=\"video-desc js-video-title\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"js-video video-wrap\" data-videoid=\"mm8YogNczeA\"\u003e\n\u003cdiv class=\"video-frame\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/mm8YogNczeA?enablejsapi=1\u0026amp;origin=https%3A%2F%2Fwww.celestron.com\" data-gtm-yt-inspected-2574542_66=\"true\" id=\"47093753\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv class=\"video-desc js-video-title\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"js-video video-wrap\" data-videoid=\"ikSPdasfEwA\"\u003e\n\u003cdiv class=\"video-frame\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/ikSPdasfEwA?enablejsapi=1\u0026amp;origin=https%3A%2F%2Fwww.celestron.com\" data-gtm-yt-inspected-2574542_66=\"true\" id=\"316717782\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch4\u003eFAQ \u003c\/h4\u003e\n\u003cdiv class=\"tab-content js-accordion-content rte\"\u003e\n\u003cdiv class=\"pdp-faq\"\u003e\n\u003cdiv class=\"pdp-faq-q\"\u003e\n\u003cspan class=\"faq-label\"\u003eQ:\u003c\/span\u003e\n\u003cp class=\"pdp-text-wrap\"\u003eWhat is the heaviest recommend load for mounting a camera onto the RASA 11?\u003c\/p\u003e\n\u003cspan class=\"pdp-faq-expand visible\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdp-faq-a visible\" style=\"height: auto; visibility: visible;\"\u003e\n\u003cspan class=\"faq-label\"\u003eA:\u003c\/span\u003e\n\u003cp class=\"pdp-text-wrap\"\u003eWe recommend a load of no more than 33 lbs. at 5.0 inches away from the 11\" Schmidt corrector.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdp-faq\"\u003e\n\u003cdiv class=\"pdp-faq-q\"\u003e\n\u003cspan class=\"faq-label\"\u003eQ:\u003c\/span\u003e\n\u003cp class=\"pdp-text-wrap\"\u003eI have a RASA 11, and I'm not certain if it is the original version or the V2 version. How can I tell the difference?\u003c\/p\u003e\n\u003cspan class=\"pdp-faq-expand visible\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdp-faq-a visible\" style=\"height: auto; visibility: visible;\"\u003e\n\u003cspan class=\"faq-label\"\u003eA:\u003c\/span\u003e\n\u003cp class=\"pdp-text-wrap\"\u003eThe RASA 11 V2 uses the Ultra-Stable Focus System, and therefore does not have mirror clutch knobs on the rear cell. The RASA 11 V2 also comes with the Celestron focus knob, not the Feathertouch MircoFocuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tab-content js-accordion-content rte\"\u003e\n\u003cdiv class=\"pdp-faq\"\u003e\n\u003cdiv class=\"pdp-faq-q\"\u003e\u003cspan class=\"faq-label\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdp-faq\"\u003e\n\u003cdiv class=\"pdp-faq-a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable class=\"table-open\" id=\"product-downloads-list\"\u003e\n\u003cthead class=\"product-files-manuals\"\u003e\n\u003ctr\u003e\n\u003cth\u003e\n\u003cp\u003eManuals:\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody class=\"product-files-manuals\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/91076_RASA_11v2_Manual_5lang_FlPage_Web.pdf?v=1765048614\" target=\"_blank\"\u003eRASA 11\" V2 Manual\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead class=\"product-files-software\" style=\"display: none;\"\u003e\n\u003ctr\u003e\n\u003cth\u003eSoftware \u0026amp; Firmware:\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody class=\"product-files-software\"\u003e\u003c\/tbody\u003e\n\u003cthead class=\"product-files-other\"\u003e\n\u003ctr\u003e\n\u003cth\u003eOther Product Files:\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody class=\"product-files-other\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/celestron-site-support-files.s3.amazonaws.com\/support_files\/RASA_White_Paper_2020_Web.pdf\" target=\"_blank\"\u003eWhitepaper RASA\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/RASA_2011-Customized_20Camera_20Adapter_Rev2.pdf?v=1765048629\" target=\"_blank\"\u003eCamera Adapter requirements\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Tube Info:\u003c\/th\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e279mm (11\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e620mm (24.4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral obstruction diameter\u003c\/td\u003e\n\u003ctd\u003e114mm (4.48\") (41% of aperture diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power (Compared to human eye)\u003c\/td\u003e\n\u003ctd\u003e1588x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.49 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.41 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e43.3mm (1.7\") Ø , 4.0°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable field\u003c\/td\u003e\n\u003ctd\u003e52mm (2.04\") Ø , 4.8° only minimal performance loss at edge of FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength range\u003c\/td\u003e\n\u003ctd\u003e400 - 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot size\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 4.4 um RMS across FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-axis Illumination\u003c\/td\u003e\n\u003ctd\u003e83% at 21mm (.82\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Window\u003c\/td\u003e\n\u003ctd\u003e68mm (2.67\") Ø\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack focus with included camera adapter\u003c\/td\u003e\n\u003ctd\u003e55mm (2.16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack focus from top of threaded collar\u003c\/td\u003e\n\u003ctd\u003e72.8mm (2.86\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e838.2mm (33\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e330.2mm (13\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eUltra-Stable Focus System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinder scope\u003c\/td\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e43 lbs (19.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Features\u003c\/td\u003e\n\u003ctd\u003eVentilation fan, dual dovetail mounting bars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded items\u003c\/td\u003e\n\u003ctd\u003e42mm (1.65\") T-thread camera adapter | 48mm (1.89\") camera adapter | Dust cover | Fan battery pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":50882412347611,"sku":"OPENBOX-91076","price":5937.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/products\/celestron-telescope-celestron-11-rowe-ackermann-schmidt-astrograph-rasa-11-optical-tube-assembly-cge-dovetail-91076-16178004426832.jpg?v=1746814897","url":"https:\/\/telescopescanada.ca\/fr\/products\/open-box-celestron-11-rowe-ackermann-schmidt-astrograph-rasa-11-optical-tube-assembly-cge-dovetail-91076","provider":"Telescopes Canada","version":"1.0","type":"link"}