Celestron RASA 8" Telescope w/ Computerized CGEM-II Mount Bundle - CE-12020

  • Incredible clarity from edge to edge of your image circle.
  • Portable and powerful for professionals and amateurs alike.
  • Paired with the CGEM-II Equatorial Mount for a precise and efficient astrophotography system.
  • Aperture: 203 mm (8-inch).
  • Telescope weight: 17 lb.
  • Focal length: 400 mm.
  • 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.
  • To properly power this product through an AC outlet, you will need the recommended power supply shown below. 
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  • Regular price $5,099.95
  • $3,049.00
  • You save: $2,050.95 (40%)

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Celestron RASA 8" Telescope w/ Computerized CGEM-II Mount Bundle - CE-12020

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.

Paired for Performance with the Celestron CGEM-II

The Celestron RASA 8-inch has been paired with the CGEM-II equatorial mount to bring out the best in each piece of your astrophotography system. With the 40 lb weight capacity of the CGEM-II, you can fully customize your RASA with anything you could ever want. This mount is also fully-equipped with some of the best astrophotography software available, like StarSense and CPWI to bring professional-grade performance to an amateur-friendly system.

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.  

Below you'll see an incredible image of the Rosette Nebula taken by Jason Guenzel using the Triad Ultra on the super-fast f/2.2 Celestron RASA telescope! 

Jason Guenzel Nebula with RASA and Triad Ultra

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.

Compatible Technology


The new Lithium Phosphate (LiFePO4) battery chemistry has significant advantages over other battery chemistries, great for those Astronomers on the go.

Starsense Technology

Celestron’s patented StarSense Technology makes it easier than ever to locate objects in the night sky, even if you’ve never used a telescope before. Turn it on and push ‘Align.’ In about three minutes, you’re ready to observe!


WiFi technology encircles the globe in a web of connectivity, knowledge, and information. Now, Celestron is using that same technology to allow stargazers to connect to the night sky and enhance their experience of the cosmos in fun and unique ways.


Aperture203 mm (8")
Back Focus29mm
Camera/Eyepiece Connection1.25" Nosepiece
Corrected Image Circle22mm
Database40000+ Objects
Dawes Limit0.57 arcseconds
Drive TypeLow cog DC servo motors
Focal Length400 mm
Focal Ratiof/2
Free ShippingYes
Head DesignEquatorial
Highest Magnification406x
Instrument Capacity40 lbs
Latitude Range15 to 70 Degrees
Light Gathering Power841x
Limiting Magnitude15.3
Mount Head Weight40lbs
Optical DesignRASA
PortsUSB 2.0
Power Consumption12V 3.2A
RMS Spot Size4.6 microns
Slew speed4 Degrees Per Second
Telescope ConnectionDual Vixen & Losmandy
Total Weight85.2 lbs
Tracking RatesLunar
Tracking RatesSiderial
Tracking RatesSolar
Tripod Weight19.2 lbs
Tube Length628mm
Tube Weight17 lbs
Warranty2 Year Warranty


  • 8-inch RASA Telescope.
  • M42 Camera Adapter.
  • C-thread Camera Adapter.
  • Fan Battery Pack.
  • CGEM-II Equatorial Head.
  • Steel Tripod with 2-inch Legs.
  • Accessory Tray.
  • 17 lb Counterweight.
  • NexStar+ Hand Control.
  • DC Power Cable.
  • Hand Control Holster.