Orion 6" f/9 Ritchey-Chrétien Imaging Optical Tube Assembly (08268)
08268
Orion 6" f/9 Ritchey-Chrétien Imaging Optical Tube Assembly (08268)
08268
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Product Description
The conveniently portable and compact Orion 6" Ritchey-Chrétien Astrograph telescope brings advanced imaging performance into the realm of affordability for amateur astrophotographers. This 6"-aperture optical tube combines the highly regarded Ritchey-Chrétien optical design with excellent portability, great light gathering capability, high-end features and durable construction to provide celestial shutterbugs with an exceptional instrument at an amazing value.
Unlike conventional Newtonian reflector and Schmidt Cassegrain (SCT) designs that are susceptible to displaying coma away from the center of the field, the compact Ritchey-Chrétien design utilizes hyperbolic primary and secondary mirrors to achieve wonderfully flat images that are virtually coma-free 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 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. Unlike Schmidt-Cassegrains, the primary mirror of these Ritchey-Chrétien telescopes is fixed in-place to eliminate annoying "image shift" that can wreak havoc during 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.
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).
What can I see with a Orion 6" f/9 Ritchey-Chrétien Imaging Optical Tube Assembly (08268)?
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 - 55x Magnification
(Sold Separately)
Jupiter with
10mm Eyepiece - 137x Magnification
Sold Separately
Jupiter with
5mm Eyepiece - 274x Magnification
Sold Separately
Moon with 25mm Eyepiece
55x Magnification
(Sold Separately)
Moon with 10mm Eyepiece
137x Magnification
Sold Separately
Moon with 5mm Eyepiece
274x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
38x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
55x Magnification
(Sold Separately)
Andromeda with 10mm Eyepiece
137x Magnification
Sold Separately
What's in the Box
Specifications
| Best for viewing | Brighter deep sky |
| Best for imaging | Deep sky |
| User level | Advanced |
| Optical design | Ritchey-Chretien |
| Optical diameter | 152mm |
| Focal length | 1370mm |
| Focal ratio | f/9.0 |
| Optics type | Hyperbolic |
| Eyepieces | None |
| Resolving power | 0.76arc*sec |
| Lowest useful magnification | 22x |
| Highest useful magnification | 180x |
| Highest theoretical magnification | 304x |
| Limiting stellar magnitude | 13.6 |
| Optical quality | Diffraction limited |
| Finder scope | 8x50 |
| Focuser | 2" dual-speed Crayford |
| Secondary mirror obstruction | 67mm |
| Secondary mirror obstruction by diameter | 50% |
| Secondary mirror obstruction by area | 25% |
| Mount type | Optical Tube without Mount |
| Astro-imaging capability | Lunar, planetary & long exposure |
| Tube material | Steel |
| Length of optical tube | 19.1 in. |
| Weight, optical tube | 12.1 lbs. |
| Additional included accessories |
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| Other features |
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| Warranty | One year |
