Jump to content


A review of the 31 Nagler vs. the 32 Edmund Erfle

  • Please log in to reply
50 replies to this topic

#51 PJ Anway

PJ Anway

    Double-Star Observer

  • *****
  • Moderators
  • Posts: 2698
  • Joined: 04 Jun 2003
  • Loc: North Coast

Posted 16 December 2011 - 08:32 AM

Hi all,
The FOV indicated for the 32 Edmond Erfle is 82 degrees. Isn't it 60?
Also it's described as a 6 element eyepiece. isn't it a 5-element?
Any takes on this?

By measuring the true field and calculating the apparent field, I got 72°. Closer to the stated 68° AFOV listed on Edmund's site. Also, according to the diagram on Edmund's site there are six elements in three groups. Here's the link:


By the way, I really like this eyepiece in my 4" f/10 refractor! f/10 is so very forgiving when it comes to aberrations. :grin:

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics