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* Ritchey-Chretien optical design produces superb flat-field, coma-free images that are superior to those achievable with
conventional reflector or Schmidt-Cassegrain telescopes
* The most compact Ritchey-Chretien astrograph available, at a breakthrough low price of less than $800! Until now, RCs
typically cost upwards of $10,000
* Ideal for use with StarShoot-type CCD cameras and DSLRs for deep-sky and solar system astrophotography; provides a wide,
fully illuminated field and pinpoint star clarity out to the edge of the camera
* Optical tube has eight computer-positioned baffles to ensure maximum contrast; primary mirror tube has four internal
baffles; secondary mirror light shield has internal glare thread baffle
* Compact, lightweight optical tube can be easily accommodated on medium-sized equatorial mounts
If you were asked to describe the ideal telescope for amateur astrophotography, one that offered unparalleled performance wrapped
in a compact design at an affordable price, your description would likely match our new 6" f/9 Ritchey-Chretien Astrograph. As a
leading supplier of affordable imaging equipment and solutions for amateur astronomers, Orion is proud to introduce this highly
regarded telescope design used by advanced astrophotographers and professional observatories worldwide - and even by the Hubble
Space Telescope!
Previously available only in larger apertures that cost thousands more, the outstanding optical design of the Orion 6" f/9
Ritchey-Chretien Astrograph will allow you to capture spectacular, detailed images of deep-sky objects like never before. In
contrast to conventional Newtonian reflector and Schmidt-Cassegrain systems that are susceptible to coma away from the center of
the field, the Ritchey-Chretien utilizes hyperbolic primary and secondary mirrors to achieve superb flat-field images that are
truly coma-free. In our 6" model, the mirrors are made of BK-7 optical glass with enhanced aluminum 94% - 96% reflectivity
coatings, to provide diffraction-limited performance. Since there are no lenses involved, images are also free from chromatic
aberration, which affects all but the finest, most expensive apochromatic refractors.
The Orion 6" Ritchey-Chretien Astrograph is ideal for use with small-format CCD cameras like our StarShoot line, as well as DSLR
cameras, for deep-sky and solar system astrophotography. The telescope's wide, fully illuminated flat field produces pinpoint star
clarity all the way to the edge of the camera's sensor.
The Orion 6" Ritchey-Chretien Astrograph features a machined, dual-speed (10:1) Crayford-style focuser with an engraved
millimeter scale on the drawtube. One 2-inch and two 1-inch extension rings are included for adjusting the focus position for
various cameras.
The secondary mirror is precisely center-marked to facilitate collimation. The 19-inch enameled steel optical tube weighs only
12.3 lbs. and features a dovetail mounting bar underneath, for trouble-free setup on medium or large-sized Orion equatorial
mounts. The inside of the optical tube is fortified with eight computer-positioned light baffles, and the primary mirror baffle
tube and secondary mirror light shield are also highly baffled to ensure maximum image contrast.
Without a doubt, our 6" Ritchey-Chretien Astrograph brings advanced astrophotography performance into the realm of affordability
for most amateur astronomers. More affordable than comparably sized apochromatic refractors and without the coma that afflicts
Newtonian reflectors, the Orion 6" f/9 Ritchey-Chretien Astrograph Telescope will take your astrophotography to new heights!
One-year limited warranty.
Product Specifications:
Use Astronomy & terrestrial
User level Advanced
Optical design Ritchey-Chretien
Optical diameter 152mm
Focal length 1370mm
Focal ratio f/9.0
Optics type Hyperbolic
Resolving power 0.76arc*sec
Lowest useful magnification 22x
Highest useful magnification 300x
Limiting stellar magnitude 13.6
Optical quality Diffraction limited
Finder scope None
Focuser 2" Crayford
Secondary mirror obstruction 76mm
Secondary mirror obstruction by diameter 50%
Secondary mirror obstruction by area 25%
Mount style Optical Tube without Mount
Astro-imaging capability Lunar, planetary & long exposure
Tube material Aluminum
Length of optical tube 19.1 in.
Weight, optical tube 12.3 lbs.
Additional included accessories Two 1" and one 2" removable extension tubes
Warranty One year
Included Items:
One two inch long extension ring
Two one inch long extension rings
One 1.25 inch eyepiece adapter insert
Starry Night Special Edition Software
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