TPO 8" f/8 Ritchey-Chretien Carbon Fiber Astrograph Package with Feathertouch 2" Focuser - Discontinued

  • Sale
  • Regular price $1,895.00
  • TPO 8" f/8 Ritchey-Chretien Carbon Fiber Astrograph Package with Feathertouch 2" Focuser - Discontinued

    • Sale
    • Regular price $1,895.00
    • ITEM #



    TPO 8" f/8 Ritchey-Chretien Carbon Fiber Astrograph Package with Feathertouch 2" Focuser - Discontinued

     In 1910, American optician & astronomer George Willis Ritchey & 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 look like little comets around the edges of the field), which means there will be greater image quality across a wider field of view.
    • No Chromatic Aberration: Because a Ritchey-Chretien does not use lenses or corrector plates, the design does not suffer from chromatic aberrations, or false color. If you've ever looked through an achromatic refractor (non-APO), you will have seen chromatic aberration.


    • No Spherical Aberration: The use of hyperbolic mirrors for both the primary and secondary removes the problem of spherical aberration from this optical system, an optical effect caused when light rays do not all come to focus at the same point, resulting in an image that is not in perfect focus.


    • Flat Focal Plane: The Ritchey-Chretien design has a flat focal plane. Do you know that astronomers using glass photographic plates had to bend the glass to conform to the focal plane of their telescope in order to get the entire image in focus? A flat focal plane is important, especially for those using larger sensors, so that focus will be sharp across a wider field of view.


    8 inch f/8 Ritchey-Chretien Astrograph Highlights...

    Optical Highlights: This TPO Ritchey Chretien telescope has 8 inches (200mm) of aperture and a focal length of 1600mm. 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. The primary mirror is fixed in place in a metal mirror cell, and the secondary resides in a metal housing that can be collimated.

    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 very high tech and impressive-looking, 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.

    A Fixed Primary Eliminates Image Shift Schmidt-Cassegrain & Mak-Cassegrain telescopes achieve focus by moving the primary mirror back and forth inside the optical tube assembly, and this movement can cause image shift. While manufacturers have done a pretty good job of minimizing image shift on their telescopes, a moveable mirror makes it almost impossible to eliminate it completely. The Ritchey-Chretien has a primary that is fixed in place, removing the possibility of image shift and also the job of collimating the primary.

    Two Dovetails & Finderscope Base Included Talk about versatility! 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. The rails can be removed if you wish to use mounting rings (sold separately) instead. 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.

    Included with this package

    Receive the following accessories with this specially priced package:

    Starlight Instruments 2 inch Feather Touch Focuser The patented Advanced Crayford design, with the Original 10:1 Reduction Fine Focus assembly, gives the Starlight Instruments 2 inch Feather Touch Focuser a buttery smooth feel, allowing you to achieve perfect focus with a minimum of effort. All high load areas are precision ground-hardened steel on hardened steel. The Feather Touch just won't wear out, but for extra assurance Starlight Instruments offers a Limited Lifetime Warranty!

    Starlight Instruments Feather Touch Focuser Standard Features

    • Ultra-smooth coarse/fine focus knobs (10:1 Ratio)
    • Durable hardened stainless steel, steel, and aluminum construction
    • Standard Draw Tube with nylon-tipped stainless steel set screws (gentle on eyepieces)
    • 52mm threaded Draw Tube. This will accommodate permanent or semi-permanent filters if desired, such as Light Pollution Filters, clear filters for dust protection, etc. Step down adapters that reduce the 52 mm thread to 48 mm threads are available.
    • Glare resistant black internal baffling
    • Anodized aluminum fine focus knob
    • Ultra-Low backlash system for accurate control
    • Sleek aesthetic design

    TPO 0.75x Reducer. The Third Planet Optics .75X reducer greatly shortens exposure times. Two elements and extra long focal length ensure that there is plenty of room to add your off-axis guider and/or filter wheel.

    TPO Collimation Ring This specially made ring makes collimation quick and easy. A natural part of owning an RC or Newtonian telescope, a properly collimated telescope is also absolutely necessary to capture beautifully sharp images.

    TPO Product Number: 8RC-CFP-FT2

    Additional Information

    Aperture203 mm (8")
    Free ShippingYes
    Warranty2 Year Warranty

    Questions & Answers

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    • Tell us about TPO's Manufacturer, where are they made?

      These are made to TPO specs by a third party lens manufacturer. For specific information please call or email us directly. 

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