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Thread: Is this a leak in the film holder?

  1. #1

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    Is this a leak in the film holder?

    I've noticed that a number of my sheets have this slight discoloration that looks like a light leak from the film holder.
    The "leak" appears at the top right corner of the frame. It is visible on a number of vertically framed shots but not so much on horizontal.
    Also, all my film holders are numbered and I dont see any consistency on that front (unless ALL my film holders are leaking).

    I wonder if a light leak would manifest in a more dramatic fashion rather than this slight discoloration.

    Any advice on this problem?

    Thanks.Click image for larger version. 

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    Randhir
    Randhir Singh
    randhirsingh.net

  2. #2

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    Re: Is this a leak in the film holder?

    Here's another sheet with the same problem.

    Click image for larger version. 

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    Randhir Singh
    randhirsingh.net

  3. #3

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    Re: Is this a leak in the film holder?

    i dont see it. but perhaps its more visable seeing it in person?

    if its happening consistantly, it may be your camera that has the light leak?

    put a bright light inside the camera and in a darkend room, inspect the bellows, the lens mount, and the film holders for leaks.

  4. #4
    Nodda Duma's Avatar
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    Re: Is this a leak in the film holder?

    I would suggest that you also check for a
    leak between the film holder and camera body.

    -Jason
    Newly made large format dry plates available! Look:
    https://www.pictoriographica.com

  5. #5

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    Re: Is this a leak in the film holder?

    The rebate area in the upper right corner looks lighter suggesting a light leak. If the suggestion from Paul and Nodda Duma doesn't reveal a leak then it could be occurring when you are removing/inserting the dark slide before/after your exposure. The action of removing/inserting the dark slide can cause the film holder to become unseated and cause a light leak. Just before I remove/insert the dark slide to make my exposure I usually grab the edge of the camera back and place my thumb on the ground glass and exert some pressure on the ground glass. That pressure keeps the film holder seated eliminating possible light leaks.

  6. #6

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    Re: Is this a leak in the film holder?

    Thanks for the suggestions!
    I do try to be careful when inserting the dark slide but mistakes are always possible.

    The corner in question sits at the bottom left hand side when the film holder is in the camera. So this is the hinge side of the film holder. I'll go through my notes and see if there is a pattern. All my holders are numbered and I have detailed notes for each exposure.
    Randhir Singh
    randhirsingh.net

  7. #7

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    Re: Is this a leak in the film holder?

    If it turns out to be a hinge issue book binding tape should solve it.

  8. #8

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    Re: Is this a leak in the film holder?

    Quote Originally Posted by Pat Kearns View Post
    If it turns out to be a hinge issue book binding tape should solve it.
    Film-holder hinges are light-tight when closed, regardless of the taping. They are designed that way. Book-binding tape is excellent for the hinges, but plays no role in keeping light out.

    @OP: Do check the way your holders seat in the camera back and the camera back itself for cracks, warps or anything that could cause a bit of light to get in. This could also be a processing error, e.g., some kind of extra turbulence in the tank/tray at that spot during development, which would lead to extra development. If you have a lab develop your film, maybe you should point it out to them and see what they say.

    Good luck finding your problem,

    Doremus

  9. #9
    Nodda Duma's Avatar
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    Re: Is this a leak in the film holder?

    Hinges themselves may be light-tight when new, but as the wood ages it tends to shrink opening up light paths that didn’t exist before.. especially at the ends between the holder body and the hinged door/flap/end of the holder.
    Newly made large format dry plates available! Look:
    https://www.pictoriographica.com

  10. #10
    Tracy Storer's Avatar
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    Re: Is this a leak in the film holder?

    Also look for anything shiny inside the bellows that might be bouncing light into the image area.
    Tracy Storer
    Mammoth Camera Company tm
    www.mammothcamera.com

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