Page 2 of 2 FirstFirst 12
Results 11 to 13 of 13

Thread: To owners of 600mm Fujinon C lens

  1. #11

    Join Date
    Feb 2021
    Posts
    48

    Re: To owners of 600mm Fujinon C lens

    What I remember about diffraction is that it's mostly related to the absolute diameter of the iris opening, so a 600mm lens at f:128 would have roughly the diffraction of a 60mm lens at f:12.8, so it should be usable.

  2. #12
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    18,338

    Re: To owners of 600mm Fujinon C lens

    Well, I know a thing or two about this lens that hasn't changed in substance over the past 16 years that this ancient thread has been around. I sometimes make 30X40 inch full gloss color prints from 8X10 film and the 600C lens. Yes, at that scale, there will be a modest discernible difference f/64 versus f/45 or f/32. The diffraction effect is real, but negligible in smaller print sizes. Contact prints are a no-brainer; you wouldn't be able to tell the difference in a contact print even if the aperture on this particular lens were capable of being stopped down to f/256. Unevenness of plane in a conventional film holder, or sag, is a far bigger real-world issue than modest distinctions in aperture.

  3. #13

    Join Date
    Mar 2005
    Location
    Newbury, Vermont
    Posts
    2,260

    Re: To owners of 600mm Fujinon C lens

    AFAIK, the amount of (measurable, if not always visible) diffraction decreases at a given aperture as focal length increases, and does so in proportion to focal length. This also means that diffraction limitation values, at given aperture values, will likewise change with FL, making the generalizations about specific aperture values (like "be careful beyond f/32") moot if not also specified per focal length.

    Do keep in mind that this is completely irrespective of the host of other variables (environmental, mechanical, chemical, etc. etc.) with which we in this community have or will become intimately involved...like it or not!

Similar Threads

  1. 600mm Fujinon-C and Fujinon-A gone to China!
    By SAShruby in forum Cameras & Camera Accessories
    Replies: 5
    Last Post: 15-May-2006, 20:07
  2. Fujinon 300A Lens Owners – Please Read This!
    By Eric Leppanen in forum Lenses & Lens Accessories
    Replies: 4
    Last Post: 16-Jun-2005, 00:50
  3. Yousuf Karsh's lenses , fujinon 600mm f11.5 C
    By Kazuhiro Tsuji in forum On Photography
    Replies: 3
    Last Post: 8-Nov-2001, 16:38
  4. is the Fujinon 600mm C f11,5 sharp and good?
    By alec jeser in forum Cameras & Camera Accessories
    Replies: 4
    Last Post: 15-Sep-2001, 19:33

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
  •