Celestron 11" RASA Schmidt Astrograph OTA

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Celestron 11" RASA Schmidt Astrograph OTA
Item # CE-91075
6 Questions(s)

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  • The 11" Rowe-Ackermann Schmidt Astrography by Celestron was built for speed! An ultra fast optical design features a focal ratio of just f/2.22.
  • Rare-earth glass provides images with perfect color, free from coma and field curvature.
  • 52mm image circle optimized to keep tack sharp stars to the edges of even the largest imaging sensors.
  • Linear brass focuser bearing minimizes image shift. Dual speed 10:1 FeatherTouch micro focus knob allows for ultra precise focusing.
  • A 12V MagLev fan is super quiet. This high-output fan shortens cool down time and blocks dust from the interior of your optical tube.
  • Includes a M48 and T-thread adapter for quick, easy attachment to popular CCD and DSLR cameras.


The Rowe-Ackermann Schmidt Astrograph Design

The Rowe-Ackermann design pairs speed with performance.  Based on the original Schmidt camera design, the RASA optical tube offers major advantages to astro-photographers by giving you a short focal length for relatively a large aperture.  The result is a wide-field f/2.2 system offering the advantage of better apparent tracking.  With only a 620mm focal length, exposure times are also greatly reduced when compared to traditional Schmidt Cassegrain telescopes.   You'll be capturing better images in a fraction the time, without the need of an autoguider!

As CCD imaging has advanced, large sensors have become readily available in increasingly more affordable cameras.  While the imaging hobby has grown in leaps and bounds there has been very little changed in optical designs to accommodate these large imaging sensors.  That is until now.  The Celestron RASA offers an exceptionally sharp 52mm image circle.  This creates such a wide field, you'll be able to fill even the largest imaging chips with edge to edge pin point stars with minimal vignetting. The Rowe-Ackermann scopes are perfect for creating giant night sky mosaics, surveying and comet hunting.  Designed with 4-element rare-earth glass, images are free of false color, coma and field curvature.  Optical quality this excellent has been unheard of in astrographs within this price range.

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.

Includes M48 and T-Thread camera adapters and 2 year Celestron warranty.

Additional Information

Additional Information

SKU CE-91075
UPC Code 050234910750
Manufacturer Celestron
Telescope Series Celestron RASA Astrographs
Optical Design Astrograph
Mount Type None - Optical Tube Only
Warranty 2 Year Warranty
Telescope Aperture 11 in.
Telescope Focal Ratio f/2.22
Telescope Focal Length 620mm
Optical Coatings Celestron XLT
Tube Color or Finish Celestron Grey
Length of Optical Tube 33 in.
Optical Tube Weight 35 lbs.
Focuser Size 2"
Focuser Style Feather Touch
Manual or Electronic Focusing? Manual
Focusing Speeds Two-Speed
Dew Shield Included? No, Sold Separately
Diagonal Included? No - Sold Separately
Finder Included None
Eyepiece(s) Included None
Power Adapter Included None - Does Not Require Power
CD ROMs Included None
Counterweights Included N/A
Alignment Procedure N/A
Tracking Modes N/A
Objects in Database N/A
OTA Mount Type Losmandy-Style Dovetail
Tripod Type Included None, Sold Separately
Total Telescope Weight 35 lbs.
Included Items

Included Items

  • 11" RASA Optical Tube
  • M48 Camera Adapter
  • T-Thread Camera Adapter
Questions & Answers

Product Questions

What is the diameter of the image circle?
Is this scope only for astrophotography? Can it be used as a visual scope?
Is it possible to use a barlow (e.g., Televue Powermate 2x) between the RASA and the camera?
How do you collimate this telescope
Is there an operating manual available at this time ?
At what point in time does Celestron plan to start shipping the 11 RASA to market?
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