Celestron 11" RASA-OTA

Rowe-Ackermann Schmidt Astrograph OTA

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  • Technical Features

Technical Features for Celestron 11" RASA-OTA

The Celestron 91706 is a 279mm Rowe-Ackermann Schmidt astrograph that is specifically designed for photographing and imaging all kinds of celestial objects. A 11inch aperture and a f/2.2 optical system is designed for professional applications that require both a wide field of view and resolution. The 4-element lens group uses extra-low dispersion glass for images free of false color and aberrations like coma and field curvature.

The Celestron RASA has an improved StarBright XLT, which includes anti-reflection coatings on the lenses and highly reflective coatings on the mirrors, increases light transmission throughout the entire optical path. It also features a Ultra-Stable Focus System, which ensures easy and stable focusing. The integrated air-cooling system in RASA V2 features a quiet, high-output 12V MagLev fan and vents with mesh filters to prevent dust ingress.
Factory Information:
Quick Start Guide

RASA 11 V2 91706 Features:

  • 14 Inch Aperture (355.6 mm)
  • Focal Ratio f/2.2 Optical Design
  • Ultra-Stable Focus System
  • 1588X Light Gathering Power
  • StarBright XLT Optical Coating
    - Multi-coatings for Lenses
  • 4-Element Lens Group
  • 43.3 mm Optimized Image Circle
  • 55mm Camera Adapter
  • Integrated Cooling Fan
  • Dual Dovetail Bars
  • Ultra-Stable Focusing System


Optical Design:Rowe-Ackermann Schmidt Astrograph
Aperture (mm):279mm (11 in)
Focal Length:620mm (24.4 in)
Focal Ratio:f/2.2
Central obstruction diameter:114mm (4.48 in)(41% of aperture diameter)
Light Gathering Power (Compared to human eye):1588 x
Resolution (Rayleigh):0.49 arc seconds
Resolution (Dawes):0.41 arc seconds
Image Circle:43.3mm (1.7 in) Ø, 4.0°
Useable Field:52mm (2.04 in) Ø, 4.8°
Wavelength Range:400 – 700 nm
Spot Size:< 4.4 µm RMS across FOV
Optical Coatings:StarBright XLT
Off-axis Illumination:83% at 21mm (0.82 in) off-axis
Optical Window:68mm (2.67 in) Ø
Back Focus with Included Camera Adapter:55mm (2.16 in)
Back Focus from Top of Threaded Collar:72.8mm (2.86 in)
Optical Tube:Aluminum
Optical Tube Length:838.2mm (33 in)
Optical Tube Diameter:330.2mm (13 in)
Focuser:Ultra-Stable Focus System
Other Features:Ventilation Fan, Dual Dovetail Mounting Bars

Celestron 91076 Includes:
  • 42mm (1.65 in) T-thread Camera Adapter
  • 48mm (1.89 in) Camera Adapter
  • Dust cover
  • Fan Battery Pack
The Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph V2 has many exciting features for users of all types. It's one of FactoryOutletStore's best selling . See the Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph V2 gallery images above for more product views. The Celestron 11 Inch Rowe-Ackermann Schmidt Astrograph V2 is sold as a Brand New Unopened Item.