An anomaly...

Discussion in 'Darkroom Developing and Printing' started by Darin Heinz, May 4, 2008.

  1. Darin Heinz

    Darin Heinz Guest

    Hi everyone.

    Here's something interesting that was discovered after separately developing
    two rolls of 35mm T-Max film: a type of apparent exposure outside of the
    sprocket holes, starting at the beginning of the roll and tapering off in
    intensity and width, disappearing completely after about frame 10. They are
    about 2-3/4" (7cm) apart from center to center, a length of approximately
    1-3/4" (45mm) and a width (from edge of film toward sprocket holes of 1/4"
    (6.5mm) at frame 0.

    Does anyone have suggestions for why this appeared? If it were a light leak
    (both rolls exposed in the same camera, a Canon A-1 with light seals intact
    and in good condition), I would think the anomaly would exhibit itself
    throughout the entire roll, not stopping 1/3 of the way through.

    The lack of unwanted exposure throughout the width of the film (i.e. on the
    edges only) fails to support a hypothesis whereby a source of radiation was
    in proximity to the film.

    Any help in solving this mystery would be greatly appreciated. Note that the
    use of Excedrin, while instrumental in relieving me of the headache (caused
    by too much thought on the matter), has done nothing to solve the quandary
    at hand.
     
    Darin Heinz, May 4, 2008
    #1
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  2. As a guess, the thing that comes to my mind is a light leak in the cassette.
    Make sure the felt is not damaged.

    Another possibility, though less likely is a light leak in the rim of the tank.


    Geoff.
     
    Geoffrey S. Mendelson, May 4, 2008
    #2
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  3. Take those rolls and re-fix in new, fresh fixer for ten minutes.
     
    Lawrence Akutagawa, May 4, 2008
    #3
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