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Thread: DIY Filmholders

  1. #21
    Barry Young
    Join Date
    Jun 2010
    Location
    Tacoma, WA
    Posts
    33

    Re: DIY Filmholders

    Hi Michael:

    OK, thank you. Good luck with your project.

    Barry Young

  2. #22

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    1,084

    Re: DIY Filmholders

    It's been a while since I've added to this post. I did some more experimenting with the light baffle (where the dark slide slides in /out). Thanks to Erik Larsen, I found some finger springs at Omega Shielding that I'm trying out. Here is the link:

    http://www.omegashielding.com/099-720-NT.php

    My first try was to glue blackout cloth, painted flat black on one side, down on both sides of the springs. That still let some light through, so I then pried up the side of the fabric closest to the film, following a suggestion by Erik to glue the fabric down only on the edge closest to the insertion point. This seems to work well, and the opening appears to be light-tight when the dark slide is in and out.

    Next step is to complete the assembly and try it out!
    Attached Thumbnails Attached Thumbnails DSCF5400.JPG   DSCF5401.JPG  
    Last edited by Michael Roberts; 25-Aug-2019 at 09:31.

  3. #23

    Join Date
    Jul 2007
    Location
    Newcastle-upon-Tyne, England
    Posts
    25

    Re: DIY Filmholders

    I have just picked up on this thread rather late. You may have considered this already but I have used black velvet ribbon (which can purchased in a wide variety of widths), to renew light traps on cameras. David Odess has expressed a preference for this when restoring light traps on Hasselblad backs on his website. Worth a try if your experiments with felt are proving troublesome

  4. #24

    Join Date
    Feb 2007
    Location
    Grand Junction,CO
    Posts
    988

    Re: DIY Filmholders

    Hi Michael, keep up the good work. If you find you are getting leaks still, Steve's suggestion is a good one. I have used black moleskin that is similar to velvet but is adhesive backed. It is used for sealing auto windows. You can get it from 1/4 inch to 2 inches wide I believe. Good luck with the project.
    regards
    erik

  5. #25

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    1,084

    Re: DIY Filmholders

    Thanks Steve. Ribbon suggests to me a velvet/nylon combination. I'll look for David's website to see if he provides more details and will check my local fabric stores.

  6. #26

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    1,084

    Re: DIY Filmholders

    Given Paul's recent thread on his 14x17 film holder project (https://www.largeformatphotography.i...build-question , I went searching for this old thread. Finally found it (apparently search terms are case-sensitive). It was one of the old posts where the attached photos were lost in a server migration. So I searched my hard drives and found the old photos. Since the mods now allow perpetual editing, I was able to restore the old attached photos to the appropriate posts (more or less).

    Believe it or not, I am still working on these holders. Or to be more accurate, I put them away for about eight years before resuming work on them this past year (one of many projects I quit my day job to have time to get back to a couple of years ago).

    I think I solved the baffle problem (with Erik Larsen's help). I'm still working on getting the 3M adhesive tape to work.

    The last two times I have tested my first prototype in the field (once in February of this year and again in June of this year), the film fell out of the holder and into the camera bellows, i.e., the adhesive did not hold the film. Right now, my working hypothesis is I may have a problem with altitude changes. I live at 8,600' and extended time in the holder plus changing several thousand feet of altitude may be causing air between the adhesive and the film to expand/contract and loosen the film. If so, I need to do a better job of laying the tape down on the plenum with no wrinkles or make sure I press the film down in the morning before shooting or carry a changing back with me so I can check and press the film down when needed, as least during the experimental phase.

    Still hoping to perfect these!
    Attached Thumbnails Attached Thumbnails IMG_8467.JPG   IMG_8465.JPG  

  7. #27

    Join Date
    May 2006
    Location
    Wondervu, Colorado
    Posts
    1,084

    Re: DIY Filmholders

    There is also a discussion of adhesive film holders in this thread: https://www.largeformatphotography.i...hesive-holders

    Still working on applying all of Drew Wiley's suggestions and experience to this project....

  8. #28
    Tin Can's Avatar
    Join Date
    Dec 2011
    Posts
    15,053

    Re: DIY Filmholders

    Wow, a 10 year old link that still works!

    News we can use!

    Quote Originally Posted by Michael Roberts View Post
    It's been a while since I've added to this post. I did some more experimenting with the light baffle (where the dark slide slides in /out). Thanks to Erik Larsen, I found some finger springs at Omega Shielding that I'm trying out. Here is the link:

    http://www.omegashielding.com/099-720-NT.php

    My first try was to glue blackout cloth, painted flat black on one side, down on both sides of the springs. That still let some light through, so I then pried up the side of the fabric closest to the film, following a suggestion by Erik to glue the fabric down only on the edge closest to the insertion point. This seems to work well, and the opening appears to be light-tight when the dark slide is in and out.

    Next step is to complete the assembly and try it out!
    where is the monolith

  9. #29

    Join Date
    Apr 2014
    Location
    Central TX
    Posts
    527

    Re: DIY Filmholders

    What about a thin steel sheet in the middle and use magnets to tack the film down in the corners/edges? I did this in a round pinhole large format camera made of a pet food can. It held 1 to 3 sheets of 8x10. I also like the suggestion of an array of 8x10 sheets for 20x24 ULF. Tesselated ULF makes a lot of sense from a film handling perspective if you can stand the breaks in the images.

  10. #30

    Join Date
    Apr 2014
    Location
    Central TX
    Posts
    527

    Re: DIY Filmholders

    Also, in re-furbing some old holders, I noticed that some of them had internal springs that had a velvet covering and pushed a flap up into an area relieved into the opposite piece of wood. And, black gaffer's tape is light tight and I've used it to rebuild the flap hinges on old holders (plastic and wooden).

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