Celestron 8" RASA-OTA

Rowe-Ackermann Schmidt Astrograph OTA

Availability: In Stock

Brand New Includes Limited Lifetime Warranty
Returnable Item: 30 Day Guarantee i
30-Day Return Guarantee
If for any reason you are not satisfied with this product, your purchase is covered by our 30-day return policy. All contents and original packaging must be included with all returns. See all terms/conditions & restocking fee.
Ships free

  • Technical Features

Technical Features for Celestron 8" RASA-OTA

The Celestron 91073 is a 8 inch Rowe-Ackermann Schmidt astrograph that is specifically designed for astrophotography and astro-imaging. It delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. The RASA 8 features F/2.0 optical system with two advantages, better apparent tracking and shorter exposures. The

The Celestron RASA has an improved StarBright XLT multi-coating system, which includes anti-reflection coatings on the lenses and highly reflective coatings on the mirrors, increases light transmission throughout the entire optical path. The integrated air cooling system of 12V DC MagLev fan reduces cooldown time and blocks dust.
Factory Information:

91073 Features:

  • 8 Inch Aperture (203 mm)
  • Focal Ratio f/2.0 Optical Design
  • Ultra-Stable Focus System
  • 843x Light Gathering Power
  • StarBright XLT Optical Coating
  • Integrated Air Cooling System
    - 12V DC MagLev Fan Reduces Cooldown Time
  • CGE Dovetail Mounting Rail
  • Flat Field Free of Optical Aberrations
  • 25 mm Camera Adapter


Optical Design:Rowe-Ackermann Schmidt Astrograph
Aperture (mm):203 mm
Focal Length: 400 mm (15.74")
Focal Ratio:f/2.0
Central obstruction diameter:93mm (3.66 in) (46% of Aperture Diameter)
Light Gathering Power (Compared to Human Eye):843 x
Resolution (Rayleigh):0.68 arc seconds
Resolution (Dawes):0.57 arc seconds
Image Circle:22mm (.86") Ø, 3.15°
Useable Field:32mm (1.26") Ø, 4.6°
Wavelength Range:390 - 800 nm
Spot Size:< 4.6 µm RMS across Image Circle
Optical Coatings:StarBright XLT
Off-axis Illumination:93% at 11mm (.43") off-axis
Optical Window:46mm (1.81") Ø
Back Focus with Included Camera Adapter:25mm (.98")
Back Focus from Top of Threaded Collar:29mm (1.14")
Optical Tube:Aluminum
Optical Tube Length:628mm (24.7 in) length | 235mm (9.3 in) diameter
Focuser:Ultra-Stable Focusing System
Other Features:Air-cooling System, Integrated Filter mount
Dovetail:CGE Dovetail Bar

Celestron RASA Includes:
  • M42 Camera Adapter
  • C-thread Camera Adapter
  • Fan Battery Pack
The Celestron 8 Inch Rowe-Ackremann Schmidt Astrograph has many exciting features for users of all types. It's one of FactoryOutletStore's best selling . See the Celestron 8 Inch Rowe-Ackremann Schmidt Astrograph gallery images above for more product views. The Celestron 8 Inch Rowe-Ackremann Schmidt Astrograph is sold as a Brand New Unopened Item.