Thread: Widefield Imaging
View Single Post
  #3  
Old 28-09-2009, 12:19 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline 		 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
eg CFZ for a 50mm f1.8 at f/1.8 is 7.13 microns. at f13 it is 372 microns.

See poorly drawn example
Attached Thumbnails
Click for full-size image (Critical Focus Zone.JPG)
10.3 KB11 views
Reply With Quote