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 8 of 33 
Orion Telescopes
Advanced
Orion 8" f/8 Ritchey-Chretien Astrograph Telescope
$999.99
3 easy payments of $333.33
With payment plan
 
Accepted Payment
Expected Ship Date: 07/08/2018

  • 8" (200mm) aperture Ritchey-Chretien optical tube ideal for use with DSLR cameras and small-format CCDs to produce wonderfully flat, virtually coma-free astrophotos
  • 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
  • A rotatable, machined dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing provides precise focus adjustment without slippage or flexure with heavy astrophotography accessories attached
  • Three included focus extension rings (one 2" and two 1") allow focus position adjustment for use with various imaging cameras and astrophotography accessories
  • Features two dovetail finder scope bases and a unique, Orion-exclusive slotted narrow dovetail bar along the top of the tube for easy accessory attachment


Learn more
Item #  08267

Capture exceptional images of night sky wonders with the Orion 8" Ritchey-Chrétien Astrograph. This true astrograph is optimized for astrophotographic use with APS-C and 35mm CCD cameras and DSLRs. With several key advantages over Schmidt-Cassegrains and other imaging telescopes, this 8" Ritchey-Chrétien, or "RC", is a remarkable telescope that delivers amazing, flat-field images which are virtually coma-free to the edge of the fully illuminated field.

This 8" (203mm) aperture RC combines the highly regarded Ritchey-Chrétien optical design with excellent light-gathering capability, high-end features, and durable construction to provide astrophotographers with an exceptional instrument at an amazing value. Unlike conventional Newtonian reflector and Schmidt-Cassegrain designs that are susceptible to coma away from the center of the field, the Orion 8" Ritchey-Chrétien Astrograph optical tube utilizes hyperbolic primary and secondary mirrors, made of low-expansion quartz glass, to achieve wonderfully flat-field images that are virtually devoid of coma with pinpoint star clarity. Plus, since there are no lenses in an RC telescope, captured images are delightfully free of chromatic aberrations for true-color performance.

The enameled steel Orion 8" Ritchey-Chrétien optical tube is fortified with 9 internal, computer-positioned knife-edge light baffles; and both the primary mirror tube and secondary mirror light shield are highly baffled to ensure maximum image contrast for bright images rich in detail. Unlike Schmidt-Cassegrains, the primary mirror of the 8" Ritchey-Chrétien telescope is fixed in-place to eliminate annoying "image shift" that can wreak havoc during imaging sessions. Enhanced aluminum coatings on both the primary and secondary mirrors of the 8" Ritchey-Chrétien Astrograph provide 96% reflectivity with a protective quartz overcoat. Designed with collimation in mind, the secondary mirror of the 8" RC is precisely center-marked to facilitate collimation adjustments should they become necessary.

The Orion 8" RC Astrograph features a machined, dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing mechanism for enhanced rigidity and stable support of heavy astrophotography equipment. The rock-solid focuser provides 140.7mm of backfocus travel (238.1mm from the rear cell) to easily accommodate imaging accessory trains, and an engraved millimeter scale on the drawtube enables easy focus point repeatability. 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 focuser allows easy installation of optional Mini Guide Scopes and aiming devices (sold separately). The 8" Ritchey-Chrétien tips the scales at 18.5 lbs. and is equipped with a wide "Losmandy-style" dovetail bar along its underside for easy attachment to large equatorial mounts. A unique, Orion-exclusive slotted narrow dovetail bar along the top of the telescope allows easy attachment of optional guide scopes and other imaging accessories.
 

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-477-1001.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support
Visit our product support section for instruction manuals and more
  • Best for imaging
    Deep sky
  • User level
    Advanced
  • Optical design
    Ritchey-Chretien
  • Optical diameter
    200mm
  • Focal length
    1600mm
  • Focal ratio
    f/8.0
  • Optics type
    Hyperbolic
  • Eyepieces
    None
  • Resolving power
    0.58arc*sec
  • Lowest useful magnification
    29x
  • Highest useful magnification
    236x
  • Highest theoretical magnification
    400x
  • Limiting stellar magnitude
    14.2
  • Optical quality
    Diffraction limited
  • Finder scope
    None
  • Focuser
    2" dual-speed linear bearing Crayford
  • Secondary mirror obstruction
    95mm
  • Secondary mirror obstruction by diameter
    47%
  • Secondary mirror obstruction by area
    22%
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Tube material
    Steel
  • Length of optical tube
    22.0 in.
  • Weight, optical tube
    18.5 lbs.
  • Additional included accessories
    Vixen-Style dovetail mounting bar on top, Two dovetail finder scope bases for finder scopes, 1" & 2" Extension tubes
  • Other features
    Separate drawtube tension adjustment & lock knobs, Losmandy-style dovetail mounting bar on underside
  • Warranty
    One year

Orion 8" f/8 Ritchey-Chrétien Astrograph Telescope with 2" dual-speed linear-bearing Crayford focuser
Extension tube, 2" length (x1)
Extension tube, 1" length (x2)
Starry Night SE astronomy software digital download insert
 

Orders received by 1pm Eastern Standard Time for in-stock item the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
Standard Delivery to Canada: $40.00
3 Day Delivery: $62.00
2 Day Delivery: $62.00
Next Day Delivery: $76.00

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