Brand: Orion Telescopes USD

Orion 10" f/9 Ritchey-Chrétien Imaging Optical Tube Assembly (08266)

08266

Brand: Orion Telescopes USD

Orion 10" f/9 Ritchey-Chrétien Imaging Optical Tube Assembly (08266)

08266

With a host of deluxe features, durable construction, and virtually coma-free optics, the big 10" RC is the ideal choice for astrophotographers searching for a superb imaging instrument.
  • 10" (250mm) aperture, f/8 Ritchey-Chretien 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
Special Order
$2,729.95 USD

Easy Payment Options with .

How do I Special Order?
Special Order
$2,729.95 USD

Easy Payment Options with .

How do I Special Order?
Free Expert Support
Stress Free, Secure Shopping
30 Day Return Policy
Price Match Promise
Full Details What Can I See? What's in the Box? Specifications Reviews and Questions Articles, Videos, Software, Links

Product Description

Go after even the most elusive and faint deep-sky targets with the Orion 10" f/8.0 Ritchey-Chrétien Astrograph. Featuring the highly regarded Ritchey-Chrétien optical design with excellent light gathering, a host of deluxe features, durable construction, and virtually coma-free optics, the big 10" RC is the ideal choice for astrophotographers searching for a superb imaging instrument.

Unlike conventional Newtonian reflector and Schmidt Cassegrain (SCT) designs that are susceptible to displaying coma away from the center of the field, the acclaimed Ritchey-Chrétien design utilizes hyperbolic primary and secondary mirrors to achieve wonderfully flat images that are virtually coma-free with pinpoint star clarity all the way out to the field edge. Plus, since there are no lenses in an "RC" telescope, captured images are delightfully free of chromatic aberrations for true-color performance. 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.

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.

What can I see with a Orion 10" f/9 Ritchey-Chrétien Imaging Optical Tube Assembly (08266)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

25mm Eyepiece - 80x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 200x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 400x Magnification

Sold Separately

Moon with 25mm Eyepiece

80x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

200x Magnification

Sold Separately

Moon with 5mm Eyepiece

400x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

56x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

80x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

200x Magnification

Sold Separately

What's in the Box

  • Orion 10" f/8 Ritchey-Chrétien Astrograph Telescope with 3.3" dual-speed linear-bearing Crayford focuser
  • Extension tube, 2" length (x1)
  • Extension tube, 1" length (x2)
  • Battery holder for eight AA batteries (batteries not included)
  • Starry Night SE astronomy software digital download insert

Specifications

Best for Viewing Brighter deep sky
Best for imaging Deep sky
User level Advanced
Optical design Ritchey-Chretien
Optical diameter 250mm
Focal length 2000mm
Focal ratio f/8.0
Optics type Hyperbolic
Eyepieces None
Resolving power 0.46arc*sec
Lowest useful magnification 36x
Highest useful magnification 295x
Highest theoretical magnification 500x
Limiting stellar magnitude 14.7
Optical quality Diffraction limited
Finder scope None
Focuser 3" dual-speed linear bearing Crayford
Secondary mirror obstruction 110mm
Secondary mirror obstruction by diameter 43%
Secondary mirror obstruction by area 19%
Mount type Optical Tube without Mount
Astro-imaging capability Lunar, planetary & long exposure
Tube material Steel
Length of optical tube 28.4 in.
Weight, optical tube 35.3 lbs.
Additional included accessories
  • Three built-in cooling fans, with battery holder
  • 1.25" compression ring adapter
  • 1" & 2" Extension tubes
Other features
  • Losmandy-style dovetail mounting bar on underside
  • Custom Losmandy-style guidescope mounting bar
  • Two dovetail finderscope bases
Warranty One year

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

Why Should You Trust All Star Telescope?

We've Made All The Mistakes
So You Don't Have To

Learn More