Orion - 6" f/9 Ritchey-Chretien Astrograph Telescope

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The Orion 6" Ritchey-Chretien Astrograph is an affordable optical instrument for amateur astrophotographers, including excellent light gathering power, coma-free images, 96% reflectivity, and rotatable 2" dual-speed 10:1 Crayford focuser.

SKU: ORI-08268
Manufactured by:
Orion
 

Product Description

The Orion 6" Ritchey-Chretien Astrograph is an affordable optical instrument for amateur astrophotographers, including excellent light gathering power, coma-free images, 96% reflectivity, and rotatable 2" dual-speed 10:1 Crayford focuser. The Ritchey-Chretien optical design evades the coma effect normally seen in most Newtonian Reflector and Schmidt-Cassegrain telescopes. Without the addition of lenses, chromatic aberration is also eliminated displaying true colors. The enameled steel 6" optical tube is fortified with seven computer-positioned internal light baffles, and both the primary mirror tube and secondary mirror light shield are also highly baffled to ensure maximum image contrast. Ritchey-Chretien telescopes have fixed primary primary mirrors to avoid image shift which can damage imaging sessions. All these elements come together to make Orion Ritchey-Chrétien Astrographs ideal tools for capturing detailed images of deep-space objects with small-format CCD cameras and DSLR cameras with APS-C sized sensors. 

  • 6" (152mm) aperture, f/9 Ritchey-Chrétien optical tube ideal for use with DSLR cameras and small-format CCD imagers to produce wonderfully flat, virtually coma-free images
  • Hyperbolic primary and secondary mirrors with enhanced aluminum coatings boast 96% reflectivity for bright imaging performance
  • Conveniently compact and portable astrograph ideal for on-the-go astrophotographers
  • Rotatable, 2" dual-speed (10:1) machined Crayford focuser provides precise focus adjustment control
  • Features two dovetail finder scope bases and includes one 2" and two 1" focus extension rings so you can adjust focus position for various imaging cameras and accessories

 

Enhanced aluminum coatings on both the primary and secondary mirrors of the 6" Ritchey-Chrétien Astrograph provide exceptional 96% reflectivity with a protective quartz overcoat. The secondary mirror of the 6" RC is precisely center-marked to facilitate collimation. A machined, rotatable dual-speed (10:1) Crayford focuser with an engraved millimeter scale on the drawtube provides 151.3mm of backfocus distance to easily accommodate imaging gear as well as provide precise focus control. One 2" and two 1" focus extension rings are included so you can adjust focus position for various imaging cameras and accessories. The Orion 6" Ritchey-Chrétien Astrograph features two dovetail finder scope bases positioned on either side of the focuser for easy installation of optional Mini Guide Scopes and aiming devices (finder scopes and Mini Guide Scopes sold separately).

The 6" RC optical tube features a narrow "Vixen-style" dovetail mounting bar for trouble-free setup on medium equatorial mounts. The lightweight 6" RC tips the scales at just 12.1 lbs., so this high-quality astrograph doesn't require an enormous mount to keep it steady. You can achieve wonderful imaging results with the 6" RC attached to a medium equatorial mount such as the Orion Sirius EQ-G (sold separately).

 

 

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Specifications

Name Orion - 6" f/9 Ritchey-Chretien Astrograph Telescope
Manufacturer Orion
Model ORI-08268
Diameter 152mm
Eyepieces None
Finderscope None
Focal Length 1370mm
Focal Ratio f/9.0
Focuser 2" dual-speed Crayford
Highest Useful Magnification 180x
Included Accessories Cheshire Collimating Eyepiece, 1.25" Compression ring adapter
Limiting Stellar Magnitude 13.6
Lowest Useful Magnification 22x
Mount Optical Tube without Mount
Optical Design Ritchey-Chretien
Optical Tube Aluminum
Optical Tube Length 19.1 in
Optical Tube Weight 12.1 lbs
Resolving Power 0.76arc*sec
Secondary Mirror Obstruction 67mm
Secondary Mirror Obstruction by Area 25%
Secondary Mirror Obstruction by Diameter 50%
Warranty One year

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