The Ritchey Chretien telescope is a Cassegrain telescope without coma and a large field of view The RC has a hyperbolic primary and secundary, is used in the larger observatory telescopes like the 10 m. Keck telescope and the 2.4m. Hubble telescope. For extensive information see also the web-site of Oldham Optical . Recently we made a 14.5 inch RC for an amateur astronomer in Holland |
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