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Subject: Film camera question



I see a lot of developed film and contact sheets at my school and every once
in a while I see a roll of negatives or a contact sheet that has a thin band
of lighter tone (darker on the negatives) at the bottom of most negative
frames, as if all the frames got a little overexposure only along one edge.
Usually it's the bottom of the negative frame, and the lighter band is soft
edged and only about1 or 2 mm thick. The surrounding negative is normal and
doesn't look fogged.
Could this be caused by the shutter curtains slowing down a little at the
end of the travel distance thus giving that part of the film a tiny bit more
light? I can't determine if these defects correspong to the direction of
travel of the camera's shutter curtain, but if it was caused by an
inconsistent shutter curtain speed it should show up along the edge where
the shutter curtain ends at.
Can anyone advise on what couyld be causing this negative defect?
Thanks for any advice.



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