View Single Post
  #20  
Old 26-11-2009, 03:13 PM
pmrid's Avatar
pmrid (Peter)
Ageing badly.

pmrid is offline
 
Join Date: May 2008
Location: Cloudy, light-polluted Bribie Is.
Posts: 3,765
Quote:
Originally Posted by Satchmo View Post
RC's are coma free but suffer strongly from astigmatism without a field flattener with which they can produce very sharp round image at the edge.
Mark
Hi Mark. has anyone done any comparisons between field flatteners that suit the 8" RC?
Peter
Reply With Quote