Celestron 8" SCT optical tube, CGE/Losmandy dovetail


Availability: More on the way

This 8" SCT optical tube has advanced Starbright XLT multicoatings for Celestron's brightest images ever. It mounts directly on Celestron CGE and Losmandy GM8/G11 mounts . . .
Our Product #: C8OTAX
Celestron Product #: 90124-XLT
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Product Description

The Celestron C8 was the first Schmidt-Cassegrain telescope available to amateur astronomers. This 8" f/10 optical tube is the direct, but much improved, descendent of that original astronomical triumph. The rugged aluminum optical tube is only 17" long and weighs only 13 lbs., making it easy to transport and set up. An optional focal reducer (#8325) is available to bring the focal ratio down to a fast f/6.3 for CCD and 35mm photography.

Advanced Starbright XLT multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.

Starbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.

The optical tube comes with a 6 x 30mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 7° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also included is a removable 1.25" visual back that holds visual and photographic accessories such as a star diagonal, tele-extender, etc. A 1.25" prism type star diagonal is also standard, as is a 1.25" 25mm Plössl eyepiece. This eyepiece provides a magnification of 81x, with a 0.59° field that's almost 20% larger than the full moon.

A 4" wide dovetail slide bar runs the length of the tube for mounting on a Celestron CGE/CGEM/CGX or Losmandy GM8/G11 German equatorial mount. Optional split mounting rings are also available to put the tube on another mount of the buyer's choosing. Dust covers for the optics complete the supplied accessories.

Tech Details

Aperture 8"
Focal Length 2032mm
Focal Ratio f/10
Heaviest Single Component 13 lbs.
Highest Useful Magnification 406x
Weight 13 lbs.
Resolution 0.57 arc seconds
Visual Limiting Magnitude 14
Warranty 2 years


Review by:
The most iconic telescope which is the very embodiment of modern amateur astronomy and has been for decades. (Posted on 1/15/2023)
Review by:
I am going to also give this a 5 star review as I have zero complaints about this telescope. Most importantly to me the construction is solid and sturdy and it fits right on my mount tightly and securely. This is important as I use this for imaging as well as for viewing and I plan on keeping this scope for as long as I can and I bet it will last me a while as long as I take proper care of it. There were no scratches on the outside and the Corrector glass was perfect and clean. All of the knobs, screws, lids/caps were snug and did not have any cheap feel to it.

A couple of thoughts if imaging: I would recommend that you get the focal reducer if you plan on imaging with this scope. It makes a world of difference in the quality of my images. I have also purchased the Celestron dual speed focuser and it was simple to install and use. Similarly if you're imaging with this scope you'll want to consider the Celestron OAG as the default guide scope position makes balancing the scope on your mount just about impossible. Another option several other users have gone with is adding a dovetail mount on the top of the OTA and then mounting your guide scope to that.

I also wanted to mention that it does take right at an hour for the temperature to stabilize which is pretty standard when using SCTs. I figured with an 8" it might take longer but it doesn't, I have also tried to use it a little early and would have been best off waiting another 10 minutes.

All in All i am very happy with this scope and it performs better than what I expected for both viewing and imaging. (Posted on 7/22/2019)
Review by:
Thru they last 20 years of stargazing my best views of saturn have come with this scope on 2 different nights. I also have a 12.5 starmaster dob so this is saying something. Mine if fork mounted and I can't stress enough being comfortable for planet stargazing. with the fork mount and a good chair a plastic dew shield that is 12 inches long I can watch the planet for 20 min non stop catching all of those moments of steady seeing when the atmosphere calms. Highly recommended... I have also compared mine to the old 7" meade Mak and found that the extra inch was giving a much brighter image of DSO. With the dew shield on planets the contrast was a match... The Mak did not have a dew shield and that may have handicapped it but there was now advantage on low contrast features. (Posted on 1/5/2019)
Review by:
I have the carbon fiber version of this scope. It is fantastic for visual observation and is a fast imager. I recommend using a field flattener for astrophotography, as the edges of the image will have coma. Using a reducer/flattener makes this scope a great imaging scope. I also recommend getting a better finder scope, though, as this one is tough to use for high-elevation targets. (Posted on 12/24/2018)
Review by:
Light and portable, and with decent light grasp. If you are looking for a lightweight scope which punches above its weight, this is the one to consider. Get an electric focuser to remove the mirror flop and image shifts if you intend to image with it. (Posted on 10/12/2018)
Review by:
Nice scope. I got mine with a cgem and found the quality to be very good. Clear, crisp resolution all the way to the edge of field with my explore scientific eye pieces. (Posted on 10/6/2018)
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