http://en.wikipedia.org/wiki/Ritchey...tien_telescope
Not to be confused with Meade's version of the "Advanced Ritchey Chrétien" design. This is not a true RC.
For the real thing go here;
http://www.rcopticalsystems.com/
or
http://www.opticalguidancesystems.com/
Both the above manufacturers get the hyperbolic mirror sets (primary and secondary) from Star Instruments -
http://www.star-instruments.com/
I feel sure Fred will chime in being the owner of a fine 10" RCOS. ;-)