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 70mm 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
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
- 11" RASA Optical Tube
- M48 Camera Adapter
- T-Thread Camera Adapter
- Questions & Answers
Product QuestionsQuestion by: dane1945 on Apr 14, 2014 9:12:27 AMCelestron is still (as of 4/14/14) releasing information on their new RASA telescope. From product-images and technical information offered so far, it does not appear that the RASA will be usable as a visual telescope... it likely does not have a visual-back on the rear-cell.Answer by: Eric_B (Admin) on Apr 14, 2014 3:10:07 PMQuestion by: Richard on Apr 4, 2015 4:48:00 PMTheoretically, yes, but it would need a custom machined adapter to space the Powermate out to the correct distance and would be putting a lot of strain on the thin glass corrector plate. Generally, this is not something either we or Celestron recommend.Answer by: Chris Hendren (Admin) on Apr 7, 2015 10:59:00 AMQuestion by: Mason on Aug 15, 2016 2:26:00 AMIf behind the camera adapter, where normally a secondary mirror would be on an SCT, there is a set of collimation screws. The camera adapter is slotted so that you can reach these collimation screws with Allen Wrench while the camera is attached to the scope. With the camera attached, you can use the defocused star method to collimate the telescope.Answer by: Jonathan Cheek (Admin) on Aug 15, 2016 9:29:00 AM
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