The Celestron 8″ Rowe-Ackermann Schmidt Astrograph (RASA) optical system is a astrograph telescope, which is designed for astrophotography rather than visual use
This incredibly fast f/2.0 optical tube/telescope is the perfect companion to today’s color astronomical CMOS / USB cameras, smaller CCD cameras, and mirrorless cameras.
Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images. Weighing in at just 7.7 kilograms, its easy to transport RASA to the most remote dark sky locations.
(Requires mount or tripod) – Optical Tube (OTA) only
$5,249.00 $3,999.00 inc GST
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Add to cartThe 8″ RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems.
Optical Design | Rowe-Ackermann Schmidt Astrograph |
Aperture | 203mm (8″) |
Focal Length | 400mm (15.74″) |
Focal Ratio | f/2.0 |
Central obstruction diameter | 93mm (3.66″) (46% of aperture diameter) |
Light Gathering Power (Compared to human eye) | 843x |
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°, only minimal performance loss at edge of FOV |
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″) length | 235mm (9.3″) diameter |
Focuser | Ultra-Stable Focusing System |
Finderscope | Not included |
Optical Tube Weight | 17 lbs (7.7 kg) |
Other Features | Air-cooling system, integrated filter mount |
Included items | M42 camera adapter, C-thread camera adapter, fan battery pack |
Dovetail | CGE Dovetail Bar |