Celestron 8" Rowe-Ackermann Schmidt Astrograph f/2 Optical Tube Assembly

ITEM #
CE-91073
  • Incredible clarity from edge to edge of your image circle
  • Portable and powerful for professionals and amateurs alike
  • Aperture: 203 mm (8-inch) 
  • Telescope weight: 17 lbs.
  • Back focus: 29 mm (25 mm with included adapters).
  • Optimized for sensors with a 22 mm diagonal.
  • PLEASE NOTE: The 8-inch RASA will not work with standard DSLR + T-Ring systems.
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  • Regular price $2,799.95
  • $1,699.00
  • You save: $1,100.95 (39%)

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Celestron 8" Rowe-Ackermann Schmidt Astrograph f/2 Optical Tube Assembly

The Rowe-Ackermann Schmidt Astrograph, known mainly as the Celestron RASA, became one of the best astrophotography telescopes the moment it was released. Since then, it's popularity has only grown due to the incredibly fast optics for efficient imaging, absurdly clear optics from edge to edge of the aperture, and the fact that it's one of the most reasonably priced, professional-grade telescopes available. Any astrophotographer will say the same great things about the Celestron RASA astrograph telescope. Experience as close to perfection as you can get in a portable package with the RASA series telescopes.  

Fast Optics for Short Exposures & "Real-Time" Observing

Use shorter exposure times to capture detail in faint objects with its f/2.0 optical system. When combined with sensitive cameras and the proper “live stacking” software, the 8-inch RASA can provide an almost real-time observing experience. Instantly view images on a computer that are brighter and more detailed than what you would see with the naked eye in bigger telescopes.

Because shorter exposure times are possible, your equatorial mount won’t need to accurately track over extended periods. The 8-inch RASA’s relatively short 400 mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required.  

An Astrograph for Everyone

The 8-inch 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.

It has many of the same thoughtfully designed features as its “big brother” RASA 11, including, the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar.

Focusing Made Easy

Focusing is easier, more accurate and more stable with its new focuser design that mitigates lateral movement of the primary mirror when tracking with the astrograph, focusing or slewing. Two sets of precision bearings are precisely aligned and tested during assembly to ensure optimal results.

Imaging in the Modern Age

Designed to pair with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras, it is optimized for sensors with up to a 22 mm diagonal. It can accept larger sensors (up to 32 mm diagonal) as well. APS-C sized sensors used in many mirrorless cameras.

Camera adapters to connect C-mount cameras and cameras which mount with M42 threads are included.  

Please note: The 8-inch RASA will not work with standard DSLR + T-Ring systems. Celestron offers optional adapters to connect your 8-inch RASA to Sony or Canon mirrorless cameras.

Highlighted Features of the Celestron RASA

  • Designed with a Schmidt corrector, primary mirror, lens group and optical window.
  • The 8-inch RASA’s optics are designed to perform over a wider spectral range, from 390-800 nm. This allows more of the light emitted from the astronomical object to be sharply focused in the image.
  • A removable optical window, so you can maintain peak optical performance if a filter is added or if a camera has its own optical window.
  • Celestron offers a Light Pollution Imaging Filter designed specifically for the 8-inch RASA, which mounts in place of the optical window.
  • All refractive optical surfaces are coated with StarBright XLT coatings, while the primary mirror uses enhanced aluminum coatings.

SPECIFICATIONS

Aperture203 mm (8")
Back Focus29mm
Corrected Image Circle22mm
Dawes Limit0.57 arcseconds
Focal Length400 mm
Focal Ratiof/2
Free ShippingYes
Hightest Magnification406x
Light Gathering Power841x
Limiting Magnitude15.3
Optical DesignRowe Ackermann Schmidt Astrograph
RMS Spot Size4.6 microns
Tube Length628mm
Tube Weight17 lbs

INCLUDED ITEMS

  • 8-inch RASA Telescope.
  • M42 Camera Adapter.
  • C-thread Camera Adapter.
  • Fan Battery Pack.

Customer Reviews

5 Based on 3 Reviews
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RW
08/13/2019
Richard W.

ZWO ASI 183 PRO paired with the 8" RASA ... a match made for the heavens!

I am very happy with the 8" RASA! I added the Celestron filter for the RASA, the slide filter assembly and used a ZWO ASI183 camera. Placed on the Orion HDX110 with a 60mm guide scope and ZWO ASI290. I also tried it with the Sony a6300 camera which I found to have design issues with the adapter now that the Sony cameras have added the grip which rubs the retaining ring. Workable but annoying! John Glenn Astronomy Park, after the moon set. 8-9-19 and 8-10-19 I used the RASA on two nights. I can say, I was impressed with the 8" RASA and ZWO ASI183 combination! M31 was edge to edge in 120 seconds. M27 resolved picture perfect in 60 seconds. M57 was small yet amazing at 90 seconds. I also took several images of M33 ... 60 seconds it was a wispy fuzz, at 90 seconds it was pretty good, and at 120 seconds it was a picture worth sharing! I can't wait to stack a 20 frames of M33! ... ZWOair works well with the Orion HDX but don't forget the upload the latest firmware for both and add Skysafari 6 plus.

EH
07/26/2019
Ernesto H.
United States United States

Celestron RASA 8”

The 8” RASA hit the market at the right time. It is more affordable than the bigger siblings and also, because of its lighter weight, more versatile. The images come out crispier due to the new focusing system implemented in the new RASA. No more mirror locking needed. It’s a joy to use.

A
01/06/2019
Anonymous
Australia

very happy with the RASA

very happy with the RASA 8. Initially had trouble with mirror flop. The RASA 11 had mirror locking screws which have been removed in the RASA 8. I have suggested to Celestron that the Instruction Manual should make reference to mirror flop and what to do about it.