{"product_id":"celestron-11-rowe-ackermann-schmidt-astrograph-v2-ota-91076","title":"Celestron 11\" Rowe-Ackermann Schmidt Astrograph V2 OTA - 91076","description":"\u003ch3 style=\"text-align: center;\"\u003eCelestron 11\" Rowe-Ackermann Schmidt\u003cbr\u003e Astrograph V2 OTA\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis Celestron 11\" Rowe-Ackermann Schmidt Astrograph V2 OTA includes what you need for doing great astro-imaging\u003c\/li\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 43.3 mm optimized image circle maintains pinpoint stars to the far corners of even the largest astroimaging sensors, while the usable field will extend even further to 52 mm for larger format sensors, with very little degradation\u003c\/li\u003e\n\u003cli\u003eA New Ultra-Stable Focus System (USFS) minimizes any 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\u003eThis is a breakthrough 11 inch aperture, f\/2.2 Optical Tube Assembly (OTA) system designed for professional applications that require both a wide field of view and high resolution\u003c\/li\u003e\n\u003cli\u003eA 4-element lens group utilizes extra-low dispersion (ED) glass for images free of false color, coma, and field curvature\u003c\/li\u003e\n\u003cli\u003eCelestron's Rowe-Ackermann Schmidt Astrograph (RASA) 11\" V2 is the perfect choice for advanced astroimaging tasks and also ideal for use in space surveillance and other scientific applications\u003c\/li\u003e\n\u003cli\u003eA 43.3 mm optimized image circle maintains pinpoint stars to the far corners of the largest available sensors\u003c\/li\u003e\n\u003cli\u003eExtended spectral range takes advantage of sensor response in the 700-900 nm range, allowing brighter overall images\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSome Information About the RASA Technology:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron’s proprietary XLT coatings, which are high-transmission multi-coatings for lenses and high reflectivity aluminum coatings, ensure good light throughput for the optical system.\u003c\/li\u003e\n\u003cli\u003eAn integrated cooling fan helps optics cool down to ambient temperature and pulls air through vents with micromesh to prevent dust ingress.\u003c\/li\u003e\n\u003cli\u003eDual dovetail bars offer flexibility to mount the optical tube and conveniently attach additional accessories via “CGE\/Losmandy” style dovetails.\u003c\/li\u003e\n\u003cli\u003eTwo sets of 2x threaded insert holes in the rear cell provide additional mounting options.\u003c\/li\u003e\n\u003cli\u003eMove and mount your optical tube with ease using the carrying handle provided on the rear cell.\u003c\/li\u003e\n\u003cli\u003eAlthough not normally needed, there are 3x sets of push-pull screws to adjust the lens group to achieve ideal optical alignment for the entire system.\u003c\/li\u003e\n\u003cli\u003eIncludes an M48 and a T-thread camera adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCapturing impressive deep-sky astroimages 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 astroimaging, 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 of this Celestron 11\" Rowe-Ackermann Schmidt Astrograph V2 also reduces the equatorial tracking demands on your mount. In many cases, autoguiding may not be required (depending upon your tasks).\u003c\/p\u003e\n\u003cp\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 cooldown time and provides optimal airflow through the dust filtered optical tube.\u003c\/p\u003e\n\u003cp\u003eEngineered as a complete astroimaging system, every component of the Celestron 11\" RASA 11 V2 Schmidt Astrograph is optimized for peak performance with DSLR and astronomical CCD cameras. Down to the thickness of the glass used in the included fully-multicoated optical window or optional imaging filter, every component of the system has been given careful engineeing thought, to work together seamlessly. The Dovetail CGE bars on the top of the optical tube provides a good way to mount optional accessories like a guidescope.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eWhat's In The Box:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e11\" Rowe-Ackermann Schmidt Astrograph V2 OTA\u003c\/li\u003e\n\u003cli\u003eDual dovetail mounting bars\u003c\/li\u003e\n\u003cli\u003e42 mm (1.65\") T-thread camera adapter\u003c\/li\u003e\n\u003cli\u003e48 mm (1.89\") camera adapter\u003c\/li\u003e\n\u003cli\u003eDust cover\u003c\/li\u003e\n\u003cli\u003eFan battery pack\u003c\/li\u003e\n\u003cli\u003eInstructions\u003c\/li\u003e\n\u003cli\u003eCelestron 2-Year Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"text-align: center;\"\u003eSpecifications:\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003e279 mm (11\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e620 mm (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\u003e114 mm (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 arcseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.41 arcseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e43.3 mm (1.7\") Ø , 4.0°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable field\u003c\/td\u003e\n\u003ctd\u003e52 mm (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 μm 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 21 mm (.82\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Window\u003c\/td\u003e\n\u003ctd\u003e68 mm (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\u003e55 mm (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\u003e72.8 mm (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\u003e838.2 mm (33\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e330.2 mm (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\u003eFinderscope\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 lb (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\u003e42 mm (1.65\") T-thread camera adapter | 48 mm (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":31297956741233,"sku":"CEL-91076","price":4009.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/91076_Rowe-Ackermann_Schmidt_Astrograph_v2_01_570x380_3x_6dcb7232-63bd-4421-9237-e489d7531507.jpg?v=1776459243","url":"https:\/\/khanscope.com\/en-fr\/products\/celestron-11-rowe-ackermann-schmidt-astrograph-v2-ota-91076","provider":"Khan Scope Centre","version":"1.0","type":"link"}