Thread: 130mm F6.9 reflector: spherical mirror?
View Single Post
  #3  
Old 22-12-2013, 10:16 AM
cometcatcher's Avatar
cometcatcher (Kevin)
<--- Comet Hale-Bopp

cometcatcher is offline 		 
Join Date: Jan 2005
Location: Cloudy Mackay
Posts: 6,542
Quote:
Originally Posted by Merlin66 View Post
if straight, the mirror is parabolic, if curved then it's spherical.
Should that be the other way around? When doing the Ronchi test with a knife edge and grid the parabolic lines are curved.
Reply With Quote