Results 1 to 3 of 3

Thread: Roll Film backs have different set backs.

  1. #1

    Roll Film backs have different set backs.

    In comparing two rolfilm backs I have, a probably newer Graphic 6x7 24 exp (yellow handle) and a later model Wista 6x7, I can visually see a difference in the setback to the pressure plate. Have you encounted this and how are you compensating for it. My use is on a Crown Graphic camera, and I would prefer to use the newer Wista back which has larger rollers. I'm thinking the Graphic back has the correct setback for focus and if it does, I'll have to compensate the GG view for the Wista, yet I'll need to use film holders as well. Thoughts?

  2. #2

    Roll Film backs have different set backs.

    There are differences in film plane register among different roll holders. Scroll down a bit on the following page and look for the table labeled "Roll Film Holder Availability":

    medfmt.8k.com/mf/rollfilmback.html

    Unfortunately, the Graphic and the Mamiya RB backs are not included, but the data in the table do confirm that there are variations.

  3. #3

    Join Date
    May 1999
    Posts
    325

    Roll Film backs have different set backs.

    And big variations. Iīm on the same matter with different cameras and holders. I didnīt be worried about roll film holders because I scarcely use my Wista 6x9 holder. Now I have read on Orenīs link that mine could be 0.30mm off. Great.

    For a long time I thought that LF was not as sharp as I expected... time later I found that my super-expensive and bright plastic screen was not absolutely flat. I replaced it with a simple&cheap GG, and sharpness arrived. I must say that since then, I am also more careful when focusing. The finer grain of my ordinary GG helps also.

    If you like accuracy, I think the only way is to load the holders and to take precise real measurements of each component. The GG must be always in the same plane with the filmīs emulsion. If not, you must add shims to your GG. If you enjoy a fresnel between the GG and the lens, things are not as easy.

Similar Threads

  1. Sheng Hao v. Dayi roll film backs
    By Joe Farrell in forum Cameras & Camera Accessories
    Replies: 4
    Last Post: 12-Feb-2006, 05:26
  2. Roll film backs for Ebony S45/SW45
    By NG Sai-kit in forum Darkroom: Film, Processing & Printing
    Replies: 5
    Last Post: 17-Sep-2001, 10:23
  3. Roll Film Backs for Linhof 6x9
    By Clive Kenyon in forum Cameras & Camera Accessories
    Replies: 5
    Last Post: 1-May-2001, 02:01
  4. Beginner's questions about roll film backs
    By Roger Rouch in forum Gear
    Replies: 2
    Last Post: 21-Nov-1999, 13:23
  5. 6x6 roll film backs for 2x3 Horseman?
    By Raymond L. Fenio in forum Darkroom: Film, Processing & Printing
    Replies: 2
    Last Post: 12-Nov-1999, 11:32

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
  •