Celestron 11in Rowe-Ackermann Schmidt Astrograph OTA

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Celestron 11in Rowe-Ackermann Schmidt Astrograph OTA

11-inch f/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature

43.3 mm 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


SKU: CEL-91075
OpticalDesign: Rowe-Ackermann Schmidt Astrograph(RASA)
Glass Elements:  
Aperture(mm): 279.4
Aperture(in): 11.0
FocalLength(mm): 620
FocalRatio: 2.2
DawesLimit(arc seconds): 0.42
RayleighLimit(arc seconds):: 0.49
LimMagnitude: 14.9
Central Obstruction(mm/%): 114/41
Spot Size(um) <4.4um RMS Over FOV
Back Focus(mm): 55 to 72.8
Wavelength Range(nm): 400-700
LightGrasp(>human eye): 1593
Fastar(Hyperstar Available): NA
ImageCircle(mm): 43.3
Focuser: FeatherTouch Dual speed focuser
Dovetail Bar: CGE/Losmandy
Vented: Fan
MirrorLock: N/A
Dewshield: N/A
Finderscope: N
Case: N
Coatings: StarBright XLT
Weight(lbs/kg): 43/19.5
MaxMagnification: N/A
MinMagnification: N/A
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