View Single Post
  #10  
Old 02-11-2013, 08:55 AM
alpal's Avatar
alpal
Registered User

alpal is offline
 
Join Date: Jan 2012
Location: Melbourne
Posts: 2,908
Quote:
Originally Posted by ghsmith45 View Post
Any spot size that is smaller than the diffraction disc is meaningless, even with perfect seeing, since it is using ray optics and ignoring the wave nature of light. I don't have the actual data, but reporting a spot size 20x smaller than some quality telescope is probably reporting a spot size smaller than the diffraction disc, so in real life the pic you get from it would be limited by the wave nature of light in perfect seeing (never going to happen) or, more realistically, by the seeing conditions.
Geoff
Still - the debate gets complicated when manufacturers make such claims.

Did you check out the Hypergraph 16 f8 pics?
It's hard to find better.
Reply With Quote