Exposure around the sprocket holes

Discussion in 'The Darkroom' started by oa123, Oct 18, 2017.

  1. oa123

    oa123 TPF Noob!

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    I'm fairly new to developing B&W (been doing my own film for about a year) and I've recently noticed a consistent phenomenon with my film that is happening across multiple types of film, multiple cameras and multiple 2 reel developing tanks. I get what I think are exposure markings around the sprockets which usually only occur during the first 5 - 10 frames or so (they do not appear on the rest of the roll). Thoughts?

    Exposure markings around sprocket holes


     
  2. Ysarex

    Ysarex Been spending a lot of time on here!

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    Looks like light leak. Could be camera back, could be film developing canister (lid), but my first reaction is it's happening in camera.

    Joe
     
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  3. oa123

    oa123 TPF Noob!

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    I thought this too, but it's been happening consistently with multiple cameras (I develop for a few friends as well and it's happened on their rolls). I also have three different 2-reel developing canisters (different brands/models) and it's happened with all of them.
     
  4. webestang64

    webestang64 No longer a newbie, moving up!

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    Also the film looks to have heavy chemical staining. You might want to check your processing technique.
     
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  5. Light Guru

    Light Guru Been spending a lot of time on here!

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    I don't think so. It looks more like the developing reel is not allowing for proper chemical movement.

    This may also be the case. Improper or not enough agitation during the development.
     
  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Looks like a light leak to me. In frame 0A it appears to reach into the image itself.
     
  7. Derrel

    Derrel Mr. Rain Cloud

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    If this same, exact thing is occurring with different cameras, they I would look at your developing tank (plastc lid??) or a safelight in the darkroom or a GraLab timer (glow-in-the-dark painted dial) in the darkroom, or a tiny light leak in the room or area where you are loading the film development reels.
     
  8. compur

    compur No longer a newbie, moving up!

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    Where do you load your reels? In a changing bag? Darkroom? Closet? ...

    Do you use a bulk loader?
     
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  9. john.margetts

    john.margetts No longer a newbie, moving up!

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    It is mostly occurring on the side of the film away from the bar-coding which basically rules out a development issue. As Sparky points out, the dark is spreading into the image area - it is a light leak.

    If it is happening with a variety of cameras and developing tanks it must be down to you.

    How and where are you opening the film cassettes? Are the developing tank lids fitted square and screwed all the way down - my older Paterson tank resists this and sometimes I have to refit the lid a couple of times in the dark.

    Are you leaving the fixer for long enough before opening the tank? Is your fixer fresh enough?
     

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