TPO 12" Truss Tube f/8 Ritchey Chretien Reflecting OTA Telescope

  • Sale
  • $3,865.50
  • Regular price $4,295.00
  • TPO 12" Truss Tube f/8 Ritchey Chretien Reflecting OTA Telescope

    • Sale
    • $3,865.50
    • Regular price $4,295.00
    • ITEM #

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    TPO 12" Truss Tube f/8 Ritchey Chretien Reflecting OTA Telescope

    The 12 inch F/8 Ritchey-Chretien Truss Tube OTA from TPO is an all round excellent scope that boasts incredible versatility, maximizing every inch of its aperture. The fixed position quartz primary mirror utterly negates image shift, and also removes the otherwise frustrating task of collimating a scopes primary mirror. Furthermore the carbon fiber truss tube design drastically reduces the threat of possible temperature shifts causing flexure, the design lending itself to minimizing thermal shifts. The Ritchey-Chretien design has virtually no coma, chromatic aberration, or spherical aberration, and is an all around improvement to the Cassegrain while attaining many of the same objectives. The TPO 12 inch F/8 RC then, is a superlative astrograph capable of almost any imaging task. One of it's most notable features is indeed its extreme versatility and adaptability. The only astro-imaging task that it is not exceptionally well suited to is wide field, as it does have a notably narrow field of view. This Third Planet Optics (TPO) Ritchey Chretien telescope has 12 inches of aperture and a focal length of 2432mm . 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.


    TPO Product Number: 12RC-TT


    Aperture304 mm (11.97")
    Back Focus288mm
    Camera/Eyepiece Connection2" nosepiece
    Dawes Limit0.38 arcseconds
    Focal Length2432 mm
    Focal Ratiof/8
    Free ShippingYes
    Glass TypeQuartz
    Hightest Magnification608x
    Limiting Magnitude16.2
    Optical DesignRitchey Chretien
    Tube Diameter485mm
    Tube Length850mm
    Tube Weight35 lbs
    Warranty2 Year Warranty

    Questions & Answers

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    • Hi: Does your 12" truss tube come with a a cover to protect the primary? Can one use it for visual observing and how is it visually? Can you see any secondary reflections?  Also, is a focal reducer to f5 or so available? Thanks so much, Larry

      The 12" Truss RC does not currently include a primary mirror cover. You can use the scope visually, but the large secondary mirror that helps imaging illumination will lower visual contrast compared to similar aperture scopes. The optics are very sharp b

    • Could you provide the dimensions of this 12" Truss Tube Length/Height/Width? Thank you

      The dimensions of this 12" Truss are: 34.125” long, 17.375” wide, 18.5” high including dovetails and the weight is 49 lbs.

    • Do you have the image circle in mm ? Also is there a focal reducer available for it and what is the image circle in mm with that focal reducer. Thank you

      Without flattener, the image circle is 30-35mm. You can use the AP-CCDT67 focal reducer which will give you approximately a 26mm. Also, Teleskop Service does make a corrector that will increase the image circle to 45mm (but it's not a reducer).

    • What is the % obstruction by the secondary mirror (diameter or area should be specified in answer)? Thanks.

      Measuring the outer diameter of the secondary baffle tube yields 5.825" or 48.5% obstruction by diameter, which is a typical value for an f/8 RC design.

    • What provision do the TPO 12" and 14" f/8 Ritchey-Chretien Truss Tube OTA have for finder scope (I.e., I plan to utilize one of the Losmandy dovetails to mount the telescope and the other for guide scope)? I think I see a finder scope bracket in one of th

      This scope comes with a foot that fits the William Optics finder brackets. This foot is placed around 45 degrees from the top plate on the back of the scope.