{"product_id":"celestron-11-rowe-ackerman-schmidt-astrograph-rasa-11-v2-optical-tube-assembly-cge-dovetail","title":"Celestron 11\" Rowe-Ackerman Schmidt Astrograph (RASA 11) V2 Optical Tube Assembly (CGE Dovetail)","description":"\u003ch3\u003ePlease note: This is a special-order item. Once ordered, this cannot be cancelled\u003c\/h3\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 astroimaging 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\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 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 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 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-multicoated 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 guidescope.\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable id=\"product-specs-list\" class=\"table-open\"\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\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\u003eUseable 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 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 21mm (0.82\") 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\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 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\u003ctr\u003e\n\u003ctd\u003eSolar Warning\u003c\/td\u003e\n\u003ctd class=\"solar-warning\"\u003e\n\u003cul class=\"solar-warning-text\"\u003e\n\u003cli\u003eNever look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.\u003c\/li\u003e\n\u003cli\u003eNever use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.\u003c\/li\u003e\n\u003cli\u003eNever leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44738010972419,"sku":"91076","price":8584.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/1859\/files\/Celestron-11-Rowe-Ackerman-Schmidt-Astrograph-RASA-11-V2-Optical-Tube-Assembly-CGE-Dovetail.jpg?v=1761843970","url":"https:\/\/www.jacobsdigital.co.nz\/en-au\/products\/celestron-11-rowe-ackerman-schmidt-astrograph-rasa-11-v2-optical-tube-assembly-cge-dovetail","provider":"Jacobs Digital","version":"1.0","type":"link"}