Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph RASA Telescope, OTA OnlySKU: CNOTARASAMfr. Part: 91075
11-inch optical tube assembly - 42 mm T-thread camera adapter - 48 mm camera adapter - 2-Year Warranty
Capturing impressive deep-sky astroimages is easier than ever with Celestron's new Rowe-Ackermann Schmidt Astrograph, the perfect companion to today's top DSLR or astronomical CCD cameras. This fast, wide-field f/2.2 system offers two huge advantages over traditional f/10 astroimaging: better apparent tracking and shorter exposures. That means you'll create better-looking astroimages in a fraction of the time, even without the use of an autoguider.
The Rowe-Ackermann Schmidt Astrograph builds on the legacy of Celestron's Schmidt Camera, which allowed astrophotographers to produce images on film in the 1970s.
Today, with CCD sensor sizes as large as film or larger the Schmidt Astrograph offers a full 70 mm optimized image circle to capture pinpoint stars on the largest imaging chips. Combine this large image circle with a focal length of just 620 mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting.
The Rowe-Ackermann Schmidt Astrograph features newly designed 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 is unprecedented for an astrograph in this price range or even that of a much more expensive instrument. The design also provides minimal vignetting.
Advanced features like a custom engineered linear brass focuser bearing and FeatherTouch Micro Focus Knob allow you to make the fine adjustments you need to capture the perfect shot. Meanwhile, a12V MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.
Engineered as a complete astroimaging system, every component of the Rowe-Ackermann 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 an optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly.
11-inch f/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature70 mm optimized image circle maintains pinpoint stars to the far corners of eventhe largest astroimaging sensorsCustom engineered linear brass focuser bearing reduces image shift, while dual-speed 10:1 FeatherTouch Micro Focus Knob provides the most precise focusingQuiet, high-output 12V MagLev fan reduces cooldown time and blocks dustCommon camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR cameras
TechnologyStarBright XLTOptical DesignRowe-Ackermann SchmidtAperture279 mmFocal Length620mmFocal Ration2.22Backfocus from front lens assembly69.26 mmBackfocus from front lens assembly69.26 mmBackfocus from included camera adapters55 mmCentral obstruction diameter114 mmFinderscopeNot includedLight Gathering Power1588xOptical CoatingsStarBright XLTTotal Telescope Kit Weight35 lbsResolution (Rayleigh)0.5 arc secondsResolution (Dawes)0.41 arc secondsOptical Tube Length33 in
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