Celestron 11" RASA - OTA Only
Brand New Includes Two Year Warranty

Product Details

The Celestron RASA is a 11-inch Rowe-Ackermann Schmidt astrograph with rare-earth glass for images free of false color, coma, and field curvature. It features fast, wide-field f/2.2 system with 2 advantages, better apparent tracking and shorter exposures. The 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.

The Celestron RASA has custom engineered linear brass focuser bearing that reduces image shift, while dual-speed 10:1 FeatherTouch Micro Focus Knob provides the most precise focusing. The quiet, high-output 12V MagLev fan reduces cooldown time and blocks dust.

RASA Features:

  • 11.0 Inch Aperture (279 mm)
  • Focal Ratio F/2.2 Optical Design
  • 4-Element Rare-Earth Glass
    - False Color & Aberrations Free Images
  • 1588x Light Gathering Power
  • StarBright XLT Optical Coating
  • 11-inch Optical Tube Assembly
  • 42 mm T-thread Camera Adapter
  • 48 mm Camera Adapter


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
Resolution (Rayleigh) : 0.5 arc seconds
Resolution (Dawes) : 0.41 arc seconds
Optical Tube Length : 33 in
Total Telescope Kit Weight : 43 lbs

Celestron RASA Includes:
  • 11-Inch Optical Tube Assembly
  • 42 mm T-Thread Camera Adapter
  • 48 mm Camera Adapter