Celestron - 8" RASA Rowe-Ackermann Schmidt Astrograph OTA - 91073

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CEL-91073
$2,079.00
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  • Celestron's 8\" RASA provides a flat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.
  • This optical tube includes a CGE dovetail mounting rail.
  • Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift
  • The Celestron Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift. Integrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal airflow while filtering out dust.
  • Internal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.
  • Performs over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.

Celestron 8" RASA Rowe-Ackermann Schmidt Astrograph OTA

Celestron RASA telescopes were designed for wide-field deep sky imaging and their 8" format offers a highly portable astrograph that mounts easily to a wide variety of equatorial mounts for an affordable imaging system that is easy to take into the field. Rowe-Ackermann Schmidt Astrographs are in remarkably fast telescope designs as well at just f/2.0 exposure times are dramatically cut down while catering to modern CMOS and smaller CCD imaging cameras along with mirrorless cameras. Sony's A7 series and the ATIK Infinity cameras are a favorite paring with these astrographs. The combined short focal length and patented optical design help to produce tack sharp images with high detail and, often, allow you to image without an autoguider altogether. The Celestron 8" RASA is just 17 pounds making it easy to lift and setup by a single person.

Celestron RASA is an imaging telescope series 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. The latest addition to the Rowe-Ackermann Schmidt Astrograph family, this 8" version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8” RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the RASA design. 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.

Please be aware. Purely designed for imaging, the 8” RASA cannot be used visually. The prime focus focal plane is located at the front of the optical system, so it cannot accommodate a traditional eyepiece.

Shorter Exposure Times and Virtual “Real-Time” Observing

Since it is an F/2.0 optical system, imagers can use shorter exposure times to capture detail in faint objects. When combined with sensitive cameras and the proper “live stacking” software, the Celestron 8" RASA can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye.

Because shorter exposure times are possible, your equatorial mount won’t need to accurately track over extended periods. The 8” RASA’s relatively short 400mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. Weighing only 17 lb, this optical tube pairs perfectly with a wide variety of mounts.

Ultra-Stable Focus System

With the launch of the 8” RASA, Celestron is unveiling a new focuser design that mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. Focusing is easier, more accurate, and more stable than ever. The key to the Ultra-Stable Focus System is two sets of precision bearings that are precisely aligned and tested during assembly to ensure optimal results.

Built for Today’s Latest Cameras

Unlike the larger Rowe-Ackermann Schmidt Astrographs that work with DSLR and large CCD cameras, the Celestron 8" RASA was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras. It is optimized for sensors with up to a 22mm diagonal, but performs well with sensors up to 32mm diagonal. The APS-C sized sensors used in many mirrorless cameras are a good choice. 42mm full frame sensors will also work, but performance will be poor at the edges of the sensor and field illumination will be reduced. Additionally, we do not recommend pairing RASA 8 with any camera body more than 4” in diameter. See the chart below to determine if your camera is compatible with RASA 8.

 

Camera Compatible with RASA 8? Adapter required
Astronomical CMOS/CCD camera with C-mount Yes C-mount adapter (included)
Astronomical CMOS/CCD camera with M42-thread mount Yes M42 adapter (included) with M42 extension tubes (not included)
Astronomical CMOS/CCD camera with other mount Yes Custom camera adapter
Canon mirrorless with APS-C sensor Yes

Canon mirrorless adapter 

(sold separately)

Sony mirrorless with APS-C sensor Yes

Sony mirrorless adapter 

(sold separately)

Canon mirrorless with full frame (42mm) sensor Yes, but not optimized across the full sensor

Canon mirrorless adapter 

(sold separately)

Sony mirrorless with full frame (42mm) sensor Yes, but not optimized across the full sensor

Sony mirrorless adapter 

(sold separately)

DSLR No --
More Information
Brand Celestron
Free Shipping Does Not Qualify for Free Shipping
Aperture 203mm (8")
Case Included No
Focal Length 400mm (15.74")
Focal Ratio f/2.0
Finderscope Included Not included
Included Dovetail CGE Dovetail Bar
Resolution - Rayleigh 0.68 arc seconds
Resolution - Dawes 0.57 arc seconds
Optical Coatings Starbright XLT
Optical Tube Length 628mm (24.7") length
Optical Tube Diameter 235mm (9.3") diameter
Optical Tube Weight 17 lbs (7.7 kg)
Warranty 2 Years
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