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Rowe-Ackermann (RASA) Telescopes
Discover Celestron’s range of Rowe-Ackermann Schmidt Astrographs (RASA), built for ultra-fast, wide-field deep-sky imaging. With exceptionally fast focal ratios of f/2 to f/2.2, capture the faintest nebulae in a fraction of the usual exposure time. From the portable 8″ model to the substantial 11″ and 14″ versions for permanent installations, benefit from Astromanie’s technical advice to build your fast imaging train.
There are 3 products.
Active filters
CELESTRON RASA 14"...
- -5%
Choosing a Celestron RASA astrograph: pure speed in astrophotography
The Rowe-Ackermann Schmidt Astrograph (RASA) is designed exclusively for celestial photography. With the camera mounted at the front of the tube, ahead of the corrector lenses, it delivers an exceptionally fast focal ratio of f/2 to f/2.2. Exposure times are reduced to one-tenth of those required by a conventional telescope, bringing out even the most diffuse nebulae in just a few minutes.
Which aperture should you choose for your projects?
- RASA 8″ (203 mm, f/2.0): Compact and easy to handle, it is simple to take into the field to capture sweeping stellar panoramas on a mid-sized sensor (APS-C).
- RASA 11″ (279 mm, f/2.2): With its ultra-stable focusing system, it fully covers large 24 × 36 mm full-frame sensors, with no loss of sharpness at the field edges.
- RASA 14″ (355 mm, f/2.2): An uncompromising design for permanent observatories, ideal for automated surveys, comet hunting and high-speed photometry.
At such a fast focal ratio, focusing demands extreme precision: adding an automatic focuser and filters designed for fast light cones ensures consistent results without focus shifts.