Orion 10" f/8 Ritchey Chretien Reflecting OTA Telescope

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Orion 10" f/8 Ritchey Chretien Reflecting OTA Telescope

  • 10-Inch (250 mm) aperture, f/8 Ritchey Chretien optical tube optimized for astrophotographic use with APS-C and full-frame (35 mm) CCD cameras and DSLRs
  • Features a big 3.3-Inch rotatable dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing to provide fine focus adjustment without slippage or flexure with heavy imaging accessories attached
  • Hyperbolic primary and secondary mirrors made of low-expansion quartz glass with enhanced aluminum coatings boast 96% reflectivity for bright imaging performance, and the secondary mirror is precisely center-marked to aid in collimation
  • Features two dovetail finder scope bases and a unique, Orion-exclusive slotted wide-format dovetail bar along the top of the telescope for easy attachment of imaging accessories
  • Three built-in 1.5-Inch cooling fans accelerate cooling of the primary mirror to reach thermal equilibrium quickly


Aperture250 mm (9.75")
Dawes Limit0.46 arcseconds
Focal Length2000 mm
Focal Ratiof/8
Highest Magnification500x
Light Gathering Power1276x
Limiting Magnitude15.7
Optical DesignRitchey Chretien
Tube Length721mm
Tube Weight35.3 lbs