Orion - 10" Truss Tube Ritchey-Chretien Astrograph

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If you have been on the fence about purchasing a Ritchey-Chrétien telescope for astrophotography, you should hop off it now and take a look at the new Orion 10" f/8 Truss Tube Ritchey-Chrétien Astrograph. It features premium quartz mirror optics housed in an ingenious truss tube support structure originally developed back in 1935 for the 200" Hale Telescope at the Palomar Observatory! This exquisitely engineered telescope is optimized for astrophotographic excellence — and will take your imaging pursuits to a whole new level!


SKU: ORI-51874
Manufactured by:
Orion
 

Product Description

Orion 10" Truss Tube Ritchey-Chretien Astrograph

If you have been on the fence about purchasing a Ritchey-Chrétien telescope for astrophotography, you should hop off it now and take a look at the new Orion 10" f/8 Truss Tube Ritchey-Chrétien Astrograph. It features premium quartz mirror optics housed in an ingenious truss tube support structure originally developed back in 1935 for the 200" Hale Telescope at the Palomar Observatory! This exquisitely engineered telescope is optimized for astrophotographic excellence — and will take your imaging pursuits to a whole new level!

  • 10" (250mm) aperture, f/8 Ritchey-Chretien optics housed in a thermally stable carbon fiber Serrurier-design truss tube assembly
  • Hyperboloid primary and secondary mirrors made of low-expansion quartz glass with 96% reflectivity for bright imaging performance
  • CNC-machined 3.3" dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing rail to provide extra support for heavy imaging loads without slippage or flexure; 2" and 1.25" compression ring accessory collars
  • D-style dovetail mounting bars on top and bottom of tube assembly, plus a dovetail finder scope base for attachment of any Orion finder scope (sold separately)
  • Three built-in 1.5" 12V DC-powered cooling fans accelerate equilibration of the primary mirror to ambient temperature

Unlike conventional Newtonian reflector and Schmidt-Cassegrain designs that are susceptible to displaying coma away from the center of the field, the Orion 10" f/8 Truss Tube Ritchey-Chrétien Astrograph utilizes hyperbolic primary and secondary mirrors to achieve wonderfully flat images that are virtually coma-free. Plus, since there are no lenses involved, images are delightfully free of chromatic aberration, for true-color performance. Both the 10" (250mm) primary mirror and the secondary mirror are figured from low-expansion quartz glass and boast enhanced aluminum coatings to provide 96% reflectivity. The primary mirror is fixed in place to eliminate annoying "image shift" that plagues Schmidt- and Maksutov-Cassegrain telescopes. The secondary mirror is precisely center-marked to facilitate collimation.

The Serrurier carbon fiber truss system is thermally very stable, minimizing the effect of ambient temperature changes on the telescope's focus. Plus, since it's an open tube, the optics cool down faster than solid tube versions. The Serrurier system utilizes two sets of opposing truss tubes on either side of the declination pivot plane, which keep the optical elements parallel to each other no matter how the telescope is oriented, thus keeping optical collimation precisely intact. Stainless steel ball and socket hardware connects the truss tubes to the telescope's three large CNC-machined aluminum support plates.

The focuser on the Orion 10" f/8 Truss Tube Ritchey-Chrétien Astrograph is a masterpiece of rigidity and precision. The CNC-machined 3.3" dual-speed (10:1) linear bearing Crayford focuser features a stainless steel rail on the drawtube that provides extra support for up to 9 lbs. of imaging gear without flexure or slippage. The focuser can be rotated 360º for image framing. Both 2" and 1.25" non-marring compression ring accessory collars permit the use of 2" or 1.25" accessories.

The Orion 10" f/8 Truss Tube Ritchey-Chrétien Astrograph tube assembly is equipped with a D-style dovetail mounting bar on both the bottom and top. A dovetail finder scope base is also installed for attachment of any Orion finder scope or reflex sight (sold separately). Three 1.5" 12V DC cooling fans are mounted on the rear cell to help accelerate optical equilibration to ambient temperature. A battery holder is included (requires eight user-supplied AA batteries), as are one 2" and two 1" threaded extension rings for use in reaching focus with various configurations of imaging cameras and accessories. Primary and secondary mirror dust covers are also provided. Weighing 35 lbs. without any additional accessories, this telescope requires an equatorial mount that can support that load, such as the Orion Atlas Pro AZ/EQ-G or HDX110 EQ-G.

Superb optics, superior design, and sensational affordability come together to make the Orion 10" f/8 Truss Tube Ritchey-Chrétien Astrograph one spectacular instrument for capturing bright, detailed images of deep-space objects with CCD cameras and APS-C and full frame DSLRs. Get yours today!

Specifications

Name Orion - 10" Truss Tube Ritchey-Chretien Astrograph
Manufacturer Orion
Model ORI-51874
Diameter 250mm
Finderscope None
Focal Ratio f/8.0
Focuser 3" dual-speed linear bearing Crayford
Highest Useful Magnification 295x
Included Accessories One 2" and two 1" extension rings, Primary and secondary mirror covers, Battery holder for fans
Limiting Stellar Magnitude 14.7
Lowest Useful Magnification 36x
Mount Optical Tube without Mount
Optical Design Ritchey-Chretien
Optical Tube Carbon graphite
Optical Tube Length 29.5 in
Resolving Power 116.00arc*sec
Secondary Mirror Obstruction 110mm
Secondary Mirror Obstruction by Area 19%
Secondary Mirror Obstruction by Diameter 44%
Warranty One year

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