Rayleigh-Criterion Telescopes Manufacturer, Supplier and Exporter
Rayleigh-Criterion Telescopes Manufacturer,Supplier,Wholesaler and Exporter Rayleigh-Criterion Telescopes Manufacturer,Supplier,Wholesaler and Exporter add Telescopes Wholesaler,Manufacturer,Supplier and Exporter to your favorite see Telescopes Wholesaler,Manufacturer,Supplier and Exporter sitemap
home > telescope > Cassegrain telescopes > Ritchey-Chretiens
What is a "Ritchey-Chretien"?
empty
telescopes knowledge   The Ritchey-Chrétien telescope or RCT is a specialized Cassegrain telescope with a hyperbolic primary and secondary mirror. It was invented in the early 1910s by American astronomer George Willis Ritchey (1864–1945) and French optician Henri Chrétien (1879–1956). Ritchey constructed the first successful RCT, which had a diameter of 0.5 metres, in 1927. The second RCT was a 1-metre instrument constructed by Ritchey for the United States Naval Observatory.

The Ritchey-Chrétien design is free of first-order coma and spherical aberration, although it does suffer from third-order coma, severe large-angle astigmatism, and comparatively severe field curvature. When focused midway between the sagittal and tangential focusing planes, stars are imaged as circles, making the RCT well suited for wide field and photographic observations. As with the other Cassegrain-configuration reflectors, the RCT has a very short optical tube assembly and compact design for a given focal length. The RCT offers good off-axis optical performance, but examples are relatively rare due to the high cost of hyperbolic primary mirror fabrication; Ritchey-Chrétien configurations are most commonly found on high-performance professional telescopes.

more optics knowledge more optics knowledge ...
empty
Telescope Designs
empty
subject related telelscopes  In general, there are two kinds of telescope systems. One is the Optical Telescope. This is our main manufacturing base. The other is the radio telescope, which is used for National & Scientific research . We manufacture only a few of these.
more subject related optics.. more subject related optics..
empty
Telescope Reviews
empty
   Telescope reviews from our clients and end users. Please feel free to post your own comments.
more optics reviews ... more optics reviews ...
 
Art No.: KP4800x400
 
400mm (16-inch), FL=4800, f/12
details require sample
 
More Cassegrains
empty
empty
empty
empty
| Maksutov-Cassegrain telescopes | Schmidt-Cassegrain telescopes | Ritchey-Chretien telescopes |
empty
empty
empty
empty
empty
empty
empty
empty
Copyright © 2002-2004 All Rights Reserved by Ritchey-Chretien telescopes manufacturer, supplier, wholesaler and exporter
empty
empty