USED 11" Rowe-Ackermann Schmidt Astrograph V1 OTA Only (91076)

USED GEAR INFORMATION This RASA is in good condition. Cosmetic imperfections are minimal. This scope will perform like new. Focusing knob has been upgraded to a FeatherTouch two stage focuser. We highly recommend this sale be completed as a local pickup. Due to the size, weight, and overall bulk of this telescope in its crate it will be difficult to estimate a shipping cost, so the price you see at checkout may be inaccurate. The pictured mount is not included in this sale. This is a Version 1 RASA. Version 2 is the current production model and has an improved focusing system as well as few smaller design improvements. Overview 11-inch f/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature 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, while dual-speed 10:1 FeatherTouch Micro Focus Knob provides the most precise focusing Quiet, high-output 12V MagLev fan reduces cooldown time and blocks dust Common camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR cameras Description 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 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. (Note: We previously published 70mm which is actually the aperture of the last lens in the telescope. The optical design has not changed). 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. 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‚Äîor 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. Product Overview Specifications Optical Design Rowe-Ackermann Schmidt Aperture 279 mm Focal Length 620 mm Focal Ratio 2.22 Backfocus from front lens assembly 72.80 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 43 lbs Included items 11-inch optical tube assembly, 42 mm T-thread camera adapter, 48 mm camera adapter Resolution (Rayleigh) 0.5 arc seconds Resolution (Dawes) 0.41 arc seconds Optical Tube Length 33 in