View Single Post
  #5  
Old 08-04-2011, 10:48 AM
koputai's Avatar
koputai (Jason)
Registered User

koputai is offline
 
Join Date: Nov 2007
Location: Sydney, Australia
Posts: 1,648
I think you'll find that cheap wide ange EP's aren't Kellners, they tend to be modified Erfles or modified Konigs.

Kellners have an FOV of only around 45 degrees, about the same as a Plossl.

If you're interested in eyepieces, here's a great read:
http://www.howardastro.org/documents/evolution_of_eyepieces.pdf

Cheers,
Jason.
Reply With Quote