Celestron 8-inch Schmidt-Cassegrain OTA with CG-5 Mount Plate

  • 203.2 mm (8-inch) Schmidt-Cassegrain Optical Tube Assembly.
  • StarBright XLT Optical Coatings.
  • Use your 1.25-inch Accessories.
  • 6x30 Finderscope.
  • The Dovetail Plate for CG-5 Advanced Series Mounts.


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  • Regular price $1,729.95
  • $999.00
  • You save: $730.95 (42%)

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Celestron 8-inch Schmidt-Cassegrain OTA with CG-5 Mount Plate

This Celestron 203.2 mm (8-inch) Schmidt-Cassegrain Optical Tube Assembly (OTA) with CG-5 Mount Plate is available individually to be used with your favorite mount. Each OTA is made to the same standards as those used on all their high-quality telescopes.

Learn About the Features of the C8 Schmidt-Cassegrain OTA

StarBright XLT Coatings

All-optical surfaces are coated with StarBright XLT coatings. These tube assemblies are equipped with the same dovetail mounting plates that are used on CG-5 mounts for easy attachment to a variety of popular mounts.

Powerful Observation

Besides seeing all of the Messier Catalog objects, you can also see hundreds of other objects like NGC, IC, and Caldwell. Turn this scope towards the planets and see amazing detail on the surface of Jupiter, Cassini's Division, and resolve details on the surface of Mars. Even the distant Uranus, Neptune, and Pluto are within your viewing reach!

Upgraded System

The Celestron C8 is Celestron's first new Schmidt-Cassegrain optical system in over a decade. The new 8-inch Schmidt-Cassegrain features a precision optical system with a 2032 mm focal length, focal ratio of f/10, and comes standard with Celestron's StarBright XLT coatings.

2 Year Warranty

Celestron warrants your telescope to be free from defects in materials and workmanship for two years. Celestron will repair or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship.

Full C8 Schmidt-Cassegrain Telescope Specifications

  • Telescope Aperture: 8-inch.
  • Telescope Focal Ratio: f/10.
  • Telescope Focal Length: 2032 mm.
  • Optical Coatings: StarBright XLT.
  • Limiting Stellar Magnitude: 14.
  • Lowest Useful Magnification: 29x.
  • Highest Useful Magnification: 480x.
  • Light-Gathering Power Compared to Human Eye: 843x.
  • Diagonal Included: Yes - 1.25-inch Star Diagonal.
  • Telescope Eyepiece(s) Included: Yes - 1 Eyepiece Included.
  • Finder Included: Yes - 6 x 30 Finder Included.
  • Focuser Style: Internal Moving Primary.
  • Focuser Size: Internal Focuser with 1.25-inch Rear Cell Adapter.
  • Focuser Speed: Single Speed.
  • Telescope OTA Length: 17 inches.
  • Telescope OTA Weight: 12.5 lb.
  • Telescope Warranty Period: 2 years.

OPT Product Number: CE-91020-XLT 


Please Note: This optical tube assembly will fit on the Celestron CG-5 and Advanced VX mounts as well as the Meade LXD55/75, the older style Losmandy GM-8, and some Vixens. It will not attach to mounts that accept a 3" dovetail, such as the CGE, G-11, Paramount, or newer GM-8. If you are unsure, please give us a call before you buy. 


Aperture203 mm (8")
Focal Length2032 mm
Focal Ratiof/10
Free ShippingYes
Optical CoatingsCelestron XLT
Optical DesignSCT
OTA Length17"
OTA Mount TypeCG 5 Dovetail
OTA Weight12.5 lbs.
Telescope SeriesCelestron Optical Tubes
Warranty2 Year Warranty


  • 203.2 mm (8-inch) Schmidt-Cassegrain XLT OTA.
  • 6x30 Optical Finderscope.
  • 1.25-inch Star Diagonal.
  • 1.25-inch Eyepiece/ 25 mm, 81x Mag.
  • Dovetail Mounting Plate, for CG-5 mounts.
  • 2 Year Warranty.




Customer Reviews
5.0 Based on 6 Reviews
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Leo R.
United States United States
I Optron mount and celestron XLT

Excellent product. Delivery was delayed (Covid 19). First time setup was easy any the accuracy of the mount is beyond expectations. Crystal clear optics in the OTA

United States
8” SCT

This Celestron telescope is terrific! I’m an amateur and don’t need lots of high-end gear, however I am interested in a great astronomical experience. This telescope is perfect - portable, easy to use, and, in my opinion, very powerful! It’s not the Hubble, but it’s pretty sweet. Going bigger is not right for me, and smaller was not satisfying. This scope is ideal.

David N.
United States
Upgrade to 8"

I bought my AVX mount with the 6" OTA. While an excellent scope and super portable, it was, after all, 6" aperture. The 8" is an excellent scope as well. Collimation looks spot on out of the box. Very smooth focusing and the handle at the back is helpful. It's not all that heavy, but gives more security when handling the OTA. Pet peeve - the finder. 6 x 30? Seriously? I get the tradeoffs but still... Also the position on the tube. It's too close to the eyepiece. I had to turn the eyepiece to the side for access. The AVX mount had no problem at all with the single counter weight being more than enough. As for the view, the improvement is quite notable, even under o.k. but not especially dark skies. Physics doesn't lie. A much better view of M-13. Clean split of the double double. M-57 neat and clear. Through out, stars were sharp and focused cleanly.

George S.
United States
OPT - Always excellent

I've only had a couple opportunities to use it. This is a replacement for an old C8. What a difference 25 years makes. The images are so. Much. Brighter. It arrived collimated right out of the box (how do they do that after shipping?). Everyone should own a C8.

United States
I Will Come Back

Received items quicker than expected.

wayne n.
United States
Celestron 8 Inch Schmidt-Cassegrain OTA with CG-5 Mount Plate

great scope-this has been a dream to use. excellent quality and OPT has done it again. thank you OPT.