Ritchey-Chrétien Reflector

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ritchey-Chrétien Reflector

 

a type of reflecting telescope. In this system, the parallel beams of light from stars strike a primary concave hyperbolic mirror, are reflected to a secondary convex hyperbolic mirror, and are focused below the secondary mirror forming the image. Spherical aberrations and coma are corrected in a Ritchey-Chrétien reflector system, and the field of view may reach 0.5–1°. Special corrector lenses are used to correct astigmatism and increase the field of view to 2°.

The system was proposed by the French optician H. Chrétien in 1922 and first constructed by the American astronomer G. Ritchey in 1928. It came into wide use in the second half of the 20th century.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Caption: The premier instrument at Chilescope is a 1-meter f/8 Ritchey-Chretien reflector with dual-Nasmyth focus on each side of its massive alt-azimuth mount.
Details: Deep Sky Instruments RC10C Ritchey-Chretien reflector with Finger Lakes Instrumentation ML11002 CCD camera.
Details: RCOS 16-inch Ritchey-Chretien reflector with an Apogee Alta U16M CCD camera.
Deep Sky Instruments recently unveiled its new RC-14C ($15,495), a 14 1/4-inch Ritchey-Chretien reflector. This f/7 astrograph features Pyrex optics hand-figured by renowned telescope maker Paul Jones and is encased in a carbon-fiber tube to virtually eliminate focus drift throughout the night.
Far from city lights and at an elevation of 4,000 feet, Rodeo was an ideal location for Cullen to build a personal observatory for his 24-inch Ritchey-Chretien reflector. As the telescope was being hoisted into the dome, Steve thought to himself, "Wouldn't it be cool if other people could use a telescope like this?" Thus the inspiration for LightBuckets was born.
Deep Sky Instruments (deepskyinstruments.com), an industry newcomer, has begun making an attractively priced 10-inch f/7.3 Ritchey-Chretien reflector designed for imaging.
DETAILS: 16-inch Ritchey-Chretien reflector, SBIG STV CCD camera.
To capture such detail, Croman relies on a 14-inch RC Optical Systems Ritchey-Chretien reflector and an ST-10XME.
And so it was that Wendee Wallach-Levy, one of those citizens, was assigned May 22, 2003, for an all-night imaging session with the observatory's 20-inch Ritchey-Chretien reflector. (She brought along her observing assistant--that was me, her husband.) Adam Block, one of the AOP's guides and telescope operators, walked her through the basics of CCD imaging.
It occurred to me that the 2,900-mm focal length of my 12 1/2-inch f/9 Ritchey-Chretien reflector, which I routinely use to obtain close-up shots of small objects, is almost three-fourths the focal length of the Tautenberg telescope (4,000 mm).
A highlight for the hard-core scope enthusiasts was Georgia amateur astronomer Tim Puckett, who detailed the design and construction of his 24-inch (60-cm) f/8 Ritchey-Chretien reflector at his private observatory in Mountaintown, north of Atlanta.