Results 1 to 3 of 3

Thread: How to tell if the rear element is wrong?

  1. #1

    Join Date
    Oct 1998
    Location
    St-Petersburg, Russia
    Posts
    60

    How to tell if the rear element is wrong?

    Hello everybody!
    Recently I've bought a used Apo-Sironar-S 180/5.6.

    Already on the ground glass I see heavy triangle-shaped coma from point light sources (does not matter are they in or out of focus) and quite fuzzy image anywhere but the very center of the image. Obviously something is wrong. I suspect the rear element is taken from another lens.

    Is there a way to tell that for sure?

    The front element has all the usual Rodenstock marking, but there is absolutely nothing on the rear one.

    For example I can measure the focal length of the rear element alone, does anybody know this value?
    Any hints are welcome

    Thanks
    Andrey

  2. #2

    Join Date
    Feb 2006
    Posts
    3,116

    Re: How to tell if the rear element is wrong?

    Return the lens.
    One man's Mede is another man's Persian.

  3. #3

    Join Date
    Feb 2012
    Location
    South Texas
    Posts
    820

    Re: How to tell if the rear element is wrong?

    Return the lens.

Similar Threads

  1. LF Lenses With No Rear Element
    By Joćo Francisco Mariano in forum Lenses & Lens Accessories
    Replies: 1
    Last Post: 9-Mar-2010, 17:24

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •