- This 11-Inch Astrograph was built for speed!
- Focal Ratio: f/2.22
- Rare Earth Glass: Perfect Color, Coma-Free, Field Curvature Free
- 43.3 mm Image Circle
- 2 Year Warranty!
Celestron 11" Rowe-Ackermann Schmidt Astrograph f/2.2 Optical Tube Assembly
This Celestron 11-inch RASA Schmidt Astrograph OTA is of 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 astrophotographers 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 43.3mm image circle. This creates such a wide field, you'll be able to fill even the largest imaging chips with edge-to-edge pinpoint 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, a 12V MagLev fan reduces cool-down 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.
|Aperture||279 mm (11")|
|Camera/Eyepiece Connection||Male T—Thread (M42x0.75)|
|Corrected Image Circle||43.3mm|
|Dawes Limit||0.42 arcseconds|
|Focal Length||620 mm|
|Light Gathering Power||1589x|
|Optical Design||Rowe Ackermann Schmidt Astrograph|
|RMS Spot Size||4.4 microns|
|Tube Weight||43 lbs|
- Celestron 11-Inch RASA Astrograph OTA
- M48 Camera Adapter
- 42 mm T-Thread Camera Adapter
- 2 Year Warranty