|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