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Subject: Re: Film camera question

Luis Ortega wrote:
> 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.

This could perhaps be as a result of the film wound onto the film
reels for development. Are the reels plastic or stainless? The light
band MAY be the result of the developer not reaching that part of the
film which is resting between the external band of concentric rings on
the spool. As to why this is not the case on the upper band, I don't
have a clue. I have not noted this on any of my B&W film processed by
me on stainless reels.

David N.


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