Results 1 to 3 of 3

Thread: Paper stops for old lens

  1. #1

    Join Date
    Jun 1999
    Posts
    78

    Paper stops for old lens

    I have an old portrait lens that I want to use. It came with a set of torn paper disks with verious size holes, apparently to be used as f-stops as there is no iris. The front of the lens unscrews to get at the set and select one for use. M y guess is that I'll be using the lens wide open, but I'd like to make a new set of stops as well. Can anyone suggest what paper to use? Or would they be better if made from thin plastic of some kind? Should I duplicate the stop diameters or should I try to calculate new ones? If so, how would I do it? Any suggestio ns would be helpful. Thanks in advance.

  2. #2

    Join Date
    Dec 2000
    Location
    Tonopah, Nevada, USA
    Posts
    6,334

    Paper stops for old lens

    I don't have any more expertise than you do so take this FWIW. I would use black kraft paper, and I never re-engineer if theirs a known to compare to. That aside I think you may have an opportunity to try different variations of larger center hole and smaller peripheral holes surrounding the main sort of like the inserts for an Imagon. You might be able to achieve something very nice that way. Make a seat-of-the-pants guess at the resultant aperture and then fine tune with flash variation for portraiture. Sounds like an ideal situation for a Polaroid back.

    If it focuses at infinity at 300mm (just a for instance) f11 would be near 27mm=300/11, and f22 would be 13.5=300/22 or so. If you can figure one out and line them up you'll know them all (unless 1 is missing)

    Another idea, if you've got a decent drawing program in the computer, draw them all there, Paint them black with ink, and cut them out.

  3. #3
    Between here and there
    Join Date
    Sep 1999
    Location
    Germany
    Posts
    514

    Paper stops for old lens

    FWIW:

    Maybe you should check Steve Grimes and how he makes his waterhouse stops at http://www.skgrimes.com/wat/

    Regards, Jimi
    "Be still and allow the mud to settle."

Similar Threads

  1. The F Stops Here - store
    By Ed Richards in forum Resources
    Replies: 4
    Last Post: 21-Feb-2006, 19:40
  2. "The F-Stops Here"
    By Doug Dolde in forum Resources
    Replies: 11
    Last Post: 9-Feb-2005, 22:42
  3. Enlarging lens to paper distance
    By Dan Fromm in forum Darkroom: Equipment
    Replies: 1
    Last Post: 30-Nov-2003, 17:24
  4. old U.S. stops vs. stanard f/stops
    By Clark Savage Jr. in forum Lenses & Lens Accessories
    Replies: 2
    Last Post: 25-May-2001, 09:33

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
  •