Celestron 8" Rowe-Ackermann Schmidt Astrograph OTA - 91073

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Item #CELE-91073

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  • Field curvature, coma, astigmatism, chromatic aberration, and other optical abnormalities are completely absent from the flat field over the entire APS-C sensor.
  • Includes a new Ultra-Stable Focus System featuring six precision sealed ball bearings for virtual image shift elimination.
  • A built-in air cooling system with 12V DC MagLev fan minimizes the time needed for cooling down while providing ideal air flow and cleaning out dust.
  • An internal filter mount enables smooth acceptance of a Light Pollution Imaging Filter into the optical path.
  • Offers performance over a wider spectral range compared to most telescopes, 390-800 nm, to allow a greater percentage of incoming light to be in sharp focus.
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  • Description

    Celestron 8" RASA Astrograph Optical Tube


    With this new portable Celestron astrograph, the 8" RASA (Rowe-Ackermann Schmidt Astrograph), you'll be able to capture breathtaking wide field views of deep sky objects in a matter of seconds. The 8" RASA's awesomely fast f/2.0 optical system works perfectly in conjuction with modern color astronomical CMOS, smaller CCD, and mirrorless cameras. This combination of a fast focal ratio and patented optical design generates sharp images with superb detail, and, in many instances, allows you to completely skip the autoguider. Plus, as it weighs only 17 pounds, transporting your 8" RASA to distant dark sky locations is easy.


    RASA Performance Made For Everyone

    The Celestron 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 is capable of capturing stunning deep sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems.

    This 8" model is the most recent addition to the RASA lineup. It offers greater portability and is much more affordable when compared to the popular 11" RASA which was highly acclaimed when it was introduced in 2014. With the addition of the economical 8" RASA, more astrophotographers will be able to take advantage of the Rowe-Ackermann design. This 8" and 11" RASAs share many of the same attentively designed features such as a built-in air-cooling system, internal filter mount, and durable CGE dovetail mounting bar.

    Designed purely for imaging, the Celestron 8" RASA will not work as a visual instrument. Since the prime focus focal plane is located at the front of the optical system, it cannot accommodate a traditional eyepiece.


    Shorter Exposure Times and Virtual "Real-Time" Observing

    Due to its extremely fast f/2.0 optical system, imagers can use minimal exposure times with the 8" RASA to capture enhanced detail in dim targets. When employed in conjunction with sensitive cameras and the appropriate "live stacking" software, the 8" RASA is capable of delivering a virtual real-time observing experience. Instantly view images on a computer with more brightness and detail than can be viewed with the naked eye using much larger telescopes.


    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

    Contrary to larger Rowe-Ackermann Schmidt Astrographs that are compatible with DSLR and large CCD cameras, the 8" version was designed with regards to color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. This telescope is not suitable for use with standard DSLR cameras. Optimized for up to 22 mm diagonal sensors, the 8" RASA also offers sufficient performance with sensors up to 32 mm diagonal. Many mirrorless cameras use APS-C sized sensors that would be an excellent option. 42 mm full frame sensors are also compatible, but performance will suffer at the edges of the sensor while field illumination is decreased. Furthermore, Celestron does not recommend pairing the 8" RASA with any 4" diameter or larger camera body.




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    What's Included

    • Celestron 8" Rowe-Ackermann Schmidt Astrograph Telescope
    • CGE Dovetail Rail
    • M42 Camera Adapter
    • C-Thread Camera Adapter
    • Fan Battery Pack

  • Dimensions & Specifications

    • Optical Design: Rowe-Ackermann Schmidt Astrograph
    • Aperture: 203 mm (8")
    • Focal Length: 400 mm
    • Focal Ratio: f/2.0
    • Central Obstruction Diameter: 93 mm (3.66"); 46% of aperture diameter
    • Light Gathering Power: 843x the human eye
    • Rayleigh Resolution: 0.68 arcseconds
    • Dawes Resolution: 0.57 arcseconds
    • Image Circle: 22 mm (0.86")
    • Usable Field: 32 mm (1.26"); 4.6º with only minimal loss of performance at the edge of the field of view
    • Wavelength Range: 390 - 800 nm
    • Spot Size: <4.6 μm RMS across image circle
    • Optical Coatings: StarBright XLT
    • Off-Axis Illumination: 93% at 11 mm (0.43")
    • Optical Window: 46 mm (1.81")
    • Backfocus Distance: 29 mm (1.14"); 25 mm (0.98") with included camera adapter
    • Optical Tube Material: Aluminum
    • Optical Tube Length: 628 mm (24.7")
    • Optical Tube Diameter: 235 mm (9.3")
    • Optical Tube Weight: 17 lbs.
    • Focuser: Ultra-Stable Focusing System
    • Additional Features: Air-cooling system; integrated filter mount
    • Dovetail: CGE mounting bar

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    Manufacturer Warranty

    2 years

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.

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