Celestron C6-A-XLT Schmidt-Cassegrain OTA with CG-5 Mount Plate

  • 6-inch Schmidt-Cassegrain OTA.
  • Light Aluminum Tube.
  • StarBright XLT Optical Coatings.
  • Allows for 1.25-inch Accessories.
  • Includes Finder, Diagonal, and Eyepiece.
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  • Regular price $1,049.95
  • $649.95
  • You save: $400.00 (38%)

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Celestron C6-A-XLT Schmidt-Cassegrain OTA with CG-5 Mount Plate

The Celestron C6-A-XLT Schmidt-Cassegrain Optical Tube Assembly (OTA) with an aperture of 152 mm (6-inch) is available individually to be used with your favorite mount. All-optical surfaces are coated with StarBright XLT coatings. These tube assemblies are equipped with the same dovetail mounting bar as used on the CG-5 series for easy attachment to a variety of popular mounts.  

Celestron guarantees uncompromising quality with a backed-up 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.  

Celestron C6-A SCT Optical Tube Features

  • 6-inch Schmidt-Cassegrain, 1500 mm focal length (f/10) Aluminum Optical Tube 
  • Celestron premium StarBright XLT coatings 
  • Included With The Celestron C6-A Optical Tube is a CG5 compatible dovetail bar for easy mounting 
  • The Celestron C6-A optical tube comes with a Celestron star diagonal and a 6x30 finderscope 
  • Celestron C6-A optical tube comes with a Celestron 2 year warranty 

Celestron C6-A SCT Optical Tube Specifications

  • 1500 mm focal length (f/10). 
  • 25 mm eyepiece included (60x).
  • Aluminum Optical Tube Assembly.
  • Celestron's premium StarBright XLT multi-coatings. 
  • 1.25-inch Star Diagonal provides more comfortable viewing position when observing objects that are high in the sky.
  • 1.25-inch Visual Back allows using various 1.25-inch accessories. 
  • 6x30 finderscope to help accurately find objects.
  • Includes a dovetail rail compatible with CG-5 Advanced Series mount.


Celestron Product Number: 91010-XLT

Please Note: This optical tube assembly will fit on the Celestron CG-5 and Advanced VX mount 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 Inch dovetail, such as the CGE, G-11, Paramount, or newer GM-8. If you are unsure, please give us a call before you buy.

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.


Aperture150 mm (6")
Camera/Eyepiece Connection24 tpi
Dawes Limit0.77 arcseconds
Focal Length1500 mm
Focal Ratiof/10
Free ShippingYes
Hightest Magnification300x
Light Gathering Power459x
Limiting Magnitude14.6
Optical DesignSCT
Secondary Obstruction45mm
Tube Diameter226mm
Tube Length406mm


  • 150 mm (6-inch) Schmidt-Cassegrain OTA.
  • 6x30 Optical Finder.
  • 1.25-inch Star Diagonal.
  • 1.25-inch Eyepiece/ 25mm, 60x mag.
  • Dovetail Rail for CG-5 Advanced Series mounts.
  • 2 Year Warranty.

Customer Reviews

5 Based on 4 Reviews
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Dale V.
United States

The Celestron 6 inch Schmidt

The Celestron 6 inch Schmidt Cassegrain OTA produces sharp, detailed views of the planets and moon, and it has enough light gathering power to see fainter deep sky objects . I used to have a high quality 5" reflector, and this scope made a very noticeable difference when viewing the rings of Saturn and the cloud bands of Jupiter.

Robert K.
United States

Excellent value

I am very happy with this telescope. After much research, I concluded that the Celestron 6" OTA offered the best bang for the buck. It also fits/works well on an Explore Scientific Twilight 1 mount, without being too heavy to lug around. OPT offered the best overall deal.

mark m.
United States

Great little scope

I got this to mount on my iOptron miniTower for outreach and just a small portable scope and it really fits the bill. Views of Saturn were great, easily saw the Cassini Division.


Wonderful spotting scope

The C6 SCT OTA is a quality product. Many years ago producing an SCT was said to be prohibitively expensive. I remember fliers circulating in either late 1969 or 1970 announcing the Celestron C8 SCT for I believe $795. This was quite a breakthrough in mass production technology at an affordable price. I purchased this 6 Celestron SCT to be used mainly as a high power spotting scope, a task it performs exceedingly well. This particular unit needed to have its corrector cleaned and while at it, I relined the baffle tubes to reduce stray light to a minimum. Now it excels in powers that other high priced conventional refractor spotting scopes only dream of. Using my binocular viewer the views are superb in the 90x to 360x range- sharp with high contrast and excellent color correction. By the way, for terrestrial spotting I often use a 90 degree correct image diagonal which is superior optically to the 45 degree version. The included dovetail plate has 1/4x20 threads that allow the OTA to be mated with a HEAVY duty tripod. This may be the ultimate spotter if you want a scope that can reach farther than even the most highly touted standard spotting scopes.