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TPO 8" Carbon Fiber f/8 Ritchey Chretien Reflecting OTA Telescope


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  • Aperture: 8 inches.
  • Focal Ratio: f/8.
  • Focal Length: 1625mm.
  • Amazing Value Imaging Telescope.

Product Details

  • In 1910, American optician and astronomer George Willis Ritchey and French astronomer Henri Chretien designed a specialized Cassegrain that would later become the telescope of choice for many observatories and professionals around the world. The Ritchey Chretien astrograph has many benefits that make this design appealing to anyone who is serious about astro-photography or imaging.

    Here are a few of those benefits:

    • Good-bye Coma: An RC has virtually no coma (stars can look like little comets around the edges of the field with some telescopes.
    • No Chromatic Aberration: Because a Ritchey Chretien does not use lenses or corrector plates, the design does not suffer from chromatic aberrations (false color).
    • No Spherical Aberration: The use of hyperbolic mirrors, for both the primary and secondary mirror, removes the problem of spherical aberration from its optical system, giving you excellent focus.

    Optical Highlights: The concave hyperbolic primary and convex hyperbolic secondary are made from low expansion quartz, and finished with a scratch-resistant highly reflective 99% dielectric coating for great contrast. 

    Multiple Knife-Edge Baffle System: The computer designed and optimized baffle system in the TPO Ritchey Chretien works wonders at keeping stray light at bay. Inside the tube are ten light baffles, and the primary and secondary mirrors are baffled as well.

    Carbon Fiber Optical Tube: Besides being modern and visually appealing, carbon fiber is light-weight, strong, and has a lower coefficient of expansion than aluminum. That means your OTA will be tough and not weigh more than it has to, but also that your focus won't tend to shift as temperatures change throughout the night.

    2-inch Dual Speed Crayford Focuser: You'll love the 2-inch 1:10 Dual Speed Crayford focuser that comes standard on this RC. The dual knobs allow you choose the speed, which you focus. One turn of the larger knob equalsten turns of the smaller knob, so small adjustments are easy to do with this efficient focuser. A 1.25-inch compression ring adapter is also included so you can use both 2-inch and 1.25-inch eyepieces. 

    A Fixed Primary Eliminates Image Shift: The Ritchey Chretien has a primary mirror that is fixed in place, removing the possibility of image shift and also the job of collimating the primary.

    Two Dovetails & Finderscope Base Included: A Losmandy-style dovetail is attached to the bottom of the OTA, and a Vixen-style dovetail rail is attached to the top for quick and easy attachment to a variety of mounts. While a finderscope is not included, the OTA comes standard with a finderscope base that will accept Vixen-style brackets (if you want an optical finder) or most red dot finders.

    Long Back Focus: 250mm allows you to mount lots of imaging gear!


  • specifications

    Aperture203 mm (8")
    Back Focus250mm
    Camera/Eyepiece Connection2" nosepiece
    Dawes Limit0.57 arcseconds
    Focal Length1624 mm
    Focal Ratiof/8
    Free ShippingYes
    Glass TypeQuartz
    Highest Magnification406x
    Limiting Magnitude15.3
    Optical DesignRitchey Chretien
    Secondary Obstruction85mm
    Tube Diameter230mm
    Tube Length559mm
    Tube Weight18.5 lbs
    Warranty2 Year Warranty
  • included items

    • Aperture: 8 inches.
    • Focal Ratio: f/8.
    • Focal Length: 1625mm.
    • Amazing Value Imaging Telescope.

Product Reviews

Customer Reviews
4.0 Based on 6 Reviews
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Filter Reviews:
Gary B.
United States United States
TPO RC 8" Carbon

I'd been looking to buy an RC8 for some time. However, like most telescopes none of the dealer had them. When OPT notified me that they had received some, I jumped on it. They did raise the price 10% but it was worth the extra cost to get it sooner. I've installed my Moonlite Focuser and re-collimated. My first images look pretty good.

Trace B.
United States United States
Very Good First Impressions

I've just started imaging with this TPO RC8 and so far I'm impressed. First published image is a nice surprise, very pleased with the results: The scope seems well built and is competing with my Paramount MYT for good looks :): Factory collimation was not bad, but not correct. Slight primary and secondary mirror adjustments using the DSI star test method easily achieved good collimation. Looking forward to both native f8 imaging and f6 with the CCDT67 reducer.

OPT Telescopes TPO 8 Carbon Fiber f/8 Ritchey Chretien Reflecting OTA Telescope Review
Matt E.
United States United States
Underwhelming and underperforming

I purchased this scope about 1 year ago and I have been trying off and on the whole time to collimate it. I have the tilt ring and I replaced the stock focuser with a Baader Diamond steel track. I have got it collimate only to take it outside and have it by all out of sorts . Finally I took it apart to find that the primary retaining g ring was so loose that it was letting the mirror slip back and forth and even spin . I tightened it down but what a colossal waste of imaging time and energy. I would say let the buyer beware on these “cheap” GSO Rc scopes. I only figured this out by reading an old article in an astronomy forum. I thought it was something I was doing and now I am out of warranty and can’t return it. Check the primary as soon as you get this scope of it is loose either tighten it or return it while you can and save yourself the frustration .

Peter B.
United States United States
Seems like a great scope!

I just got one of these used and it seems to be great. I shot this of Orion (about 20 subs, 60 seconds each with the L enhance filter.). The only problem was that the scope with the camera and electronic filter wheel was pushing the weight capacity of my mount!

OPT Telescopes TPO 8 Carbon Fiber f/8 Ritchey Chretien Reflecting OTA Telescope Review
United States United States
Seems ok so far

Service has been great. Opt is a great company. This scope was way out of collimating when I first took it out of the box. I have tried to collimating it and hope I am getting close. Collimating is probably the only down fall of this scope. The carbon fiber tube looks great and it seem well built for the price. He focuser isn’t as bad as I thought it would be after reading about these GSO manufactured that everyone is selling under different names. I will need to image with it to give a final verdict. Good so far.

Terry F.
United States
RC 8

It got here on time and in great condition