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Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph (RASA) OTA

Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph (RASA) OTA

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 sensors

Custom engineered linear brass focuser bearing reduces image shift considerably, while dual-speed 10:1 Starlight Instruments FeatherTouch Micro Focus Knob provides the most precise focusing

Quiet, 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 cameras

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.

Optical Performance
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
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.

Specifications:
Optical Design Rowe-Ackermann Schmidt
Aperture 279 mm
Focal Length 620 mm
Focal Ratio 2.22
Backfocus from front lens assembly 69.26 mm
Backfocus from included camera adapters 55 mm
Central obstruction diameter 114 mm
Finderscope Not included
Light Gathering Power (Compared to human eye) 1588x
Optical Coatings StarBright XLT
Total Telescope Kit Weight 35 lbs

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Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph (RASA) OTA

MPN: 91075





Price: 3,750.00


Capturing stunning deepsky astroimages is the design concept with Celestron’s impressive Rowe-Ackermann Schmidt Astrograph optical tube, the perfect companion for today’s 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 you’ll 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!.




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