Orion - 10" f/8 Ritchey-Chretien Astrograph Telescope

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The Orion 10" f/8.0 Ritchey-Chrétien Astrograph is a marvelous instrument for astrophotographers due to its remarkable light gathering power and coma-free optics.

SKU: ORI-08266
Manufactured by:
Orion
 

Product Description

The Orion 10" f/8.0 Ritchey-Chrétien Astrograph is a marvelous instrument for astrophotographers due to its remarkable light gathering power and coma-free optics. Since Ritchey-Chrétien design use hyperbolic primary and secondary mirrors, flat images with hardly any coma are obtained making stars appear very sharp, even at the edge of the field of view. Chromatic aberration is also hardly present since Ritchey-Chrétien designs do not use lenses. Both the primary and secondary mirrors of the Orion 10" RC are made of low-expansion quartz glass and feature enhanced aluminum coatings to provide 96% reflectivity with a protective quartz overcoat. The primary mirror of the Orion 10" Ritchey-Chrétien is fixed in-place to eliminate annoying "image shift" that plague Schmidt-Cassegrain telescopes which can wreak havoc during imaging sessions. The secondary mirror is precisely center-marked to facilitate collimation. The 10" enameled steel optical tube is fortified with 8 internal, computer-positioned, knife-edge light baffles; and both the primary mirror tube and secondary mirror light shield are also highly baffled to ensure maximum image contrast. All these elements come together to make this 10" Ritchey-Chrétien Astrograph an ideal instrument for capturing bright and detailed images of deep-space objects with APS-C and full-frame (35mm) CCD cameras and DSLRs.

  

  • 10" (250mm) aperture, f/8 Ritchey-Chrétien optical tube optimized for astrophotographic use with APS-C and full-frame (35mm) CCD cameras and DSLRs
  • Features a big 3.3" 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" cooling fans accelerate cooling of the primary mirror to reach thermal equilibrium quickly

 

The Orion 10" Ritchey-Chrétien Astrograph features a huge, 3.3" dual-speed (10:1) modified Crayford focuser with a sturdy linear track bearing which provides rigid, backlash-free support of hefty imaging cameras and accessories. An engraved millimeter scale on the focuser drawtube allows easy focus point repeatability, and the focuser provides 139.6mm of backfocus travel from the 2" collar (243.9mm from the rear cell) to accommodate imaging accessory trains. One 2" and two 1" machined focus extension rings are included so you can adjust focus position for various imaging cameras and accessories.

Two dovetail finder scope bases positioned on either side of the telescope focuser allows easy installation of optional finder scopes and aiming devices (sold separately). Three built-in 1.5" DC cooling fans on the rear cell helps accelerate mirror cooldown to save time during imaging sessions. A wide, "Losmandy-style" dovetail bar along the bottom of the telescope makes it easy to couple the 35.3 lb. Ritchey-Chrétien optical tube to heavy-duty equatorial mounts. A unique, Orion-exclusive, slotted wide dovetail bar along the top of the 10" RC facilitates easy attachment of optional guide scopes and other imaging accessories.

 

 

 

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Specifications

Name Orion - 10" f/8 Ritchey-Chretien Astrograph Telescope
Manufacturer Orion
Model ORI-08266
Diameter 250mm
Eyepieces None
Finderscope None
Focal Length 2000mm
Focal Ratio f/8.0
Focuser 3" dual-speed linear bearing Crayford
Highest Useful Magnification 295x
Included Items Three built-in cooling fans, with battery holder, 1.25" compression ring adapter, 1" & 2" Extension tubes
Limiting Stellar Magnitude 14.7
Lowest Useful Magnification 36x
Mount Not Included
Optical Design Ritchey-Chretien
Resolving Power 0.46arc*sec
Secondary Mirror Obstruction 110mm
Secondary Mirror Obstruction by Area 19%
Secondary Mirror Obstruction by Diameter 43%
Warranty One year

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