TPO 12" f/8 Ritchey-Chretien Truss Tube OTA

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TPO 12" f/8 Ritchey-Chretien Truss Tube OTA
Item # OS-12RC-TT
5 Questions(s)

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  • Aperture: 12"
  • Focal Ratio: f/8
  • Focal Length: 2432mm
  • Excellent high end astrograph
  • Versatile imaging specialized Ritchey-Chretien


The 12" F/8 Ritchey-Chretien Truss Tube OTA from TPO is an all round excellent scope that boasts incredible versatility, maximizing every inch of it's 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" F/8 RC then, is a superlative astrograph capable of almost any imaging task. One of it's most notable features is indeed it's 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" 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.
Additional Information

Additional Information

Manufacturer TPO
Telescope Series TPO Ritchey-Chretien
Optical Design Ritchey-Chretien
Mount Type None - Optical Tube Only
Warranty 2 Year Warranty
Telescope Aperture 12"
Telescope Focal Length 2432mm
Telescope Focal Ratio f/8
Optical Tube Weight 52.9 lb.
Optical Coatings 99% Dielectric
Tube Color or Finish Carbon Fiber Look
Diagonal Included? No - Sold Separately
Finder Included None
OTA Mount Type Losmandy-Style Dovetail
Included Items

Included Items

  • TPO 12" f/8 Ritchey-Chretien Truss Tube OTA
  • 3" Crayford Focuser
  • Two Losmandy D Style Dovetails
Questions & Answers

Product Questions

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
What is the % obstruction by the secondary mirror (diameter or area should be specified in answer)? Thanks.
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 the photos, but no detail is provided on finder scope mount compatibility?
Could you provide the dimensions of this 12" Truss Tube Length/Height/Width? Thank you
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
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