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Home Telescopes Optical Tube Assemblies Celestron Optical Tubes Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph (RASA) OTA
Capturing stunning deepsky astroimages is the design concept with Celestrons impressive Rowe-Ackermann Schmidt Astrograph optical tube, the perfect companion for todays top DSLR camera or astronomical CCD and CMOS cameras. This fast, wide-field f/2.2 optical system offers two major advantages over traditional f/10 astrophotography: much improved tracking and the benefit of shorter exposures. That means youll create better-looking astroimages in a fraction of the time, even without the use of an autoguider as tracking is far more forgiving at f/2.2!.
Today, with CCD / CMOS 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 core 11-inch f/2.2 optical design with rare-earth glass for images free of false colour, coma, and field curvature. A large 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 52 mm for larger format sensorsCustom engineered linear brass focuser bearing reduces image shift considerably, while dual-speed 10:1 Starlight Instruments FeatherTouch Micro Focus Knob provides the most precise focusingQuiet, high-output 12V MagLev fan reduces cooldown time and blocks dust from entering the tube assembly.Common camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR camerasThe Rowe-Ackermann Schmidt Astrograph builds on the legacy of Celestrons Schmidt Camera, which allowed astrophotographers to produce images on film in the 1970s.Optical PerformanceThe 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 FeaturesAdvanced 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.Specifications:Optical Design Rowe-Ackermann SchmidtAperture 279 mmFocal Length 620 mmFocal Ratio 2.22Backfocus from front lens assembly 69.26 mmBackfocus from included camera adapters 55 mmCentral obstruction diameter 114 mmFinderscope Not includedLight Gathering Power (Compared to human eye) 1588xOptical Coatings StarBright XLTTotal Telescope Kit Weight 35 lbs