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Thread: Sensitometer

  1. #1

    Join Date
    Aug 2004
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    Montreal Canada
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    35mm RF
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    Sensitometer

    Somebody can help me. I am beginner in densitometry. I would like to know how people process to make tests strip with step wedge. What kind of set-up do you use. I try with enlarger and step wedge. I get high density reading. The lowest is 0.79 to 3.32

    Any suggestion would be appreciate to build a sensitometer for more tests on films.

    Thank You for your help.

  2. #2

    Join Date
    Dec 2002
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    I use my enlarger for exposures of the step wedge on both paper (initially) and then film as well.

    Your density readings indicate a couple of things. The first is that the film is overexposed and the second is that the film is overdeveloped.

    Typically one would want a density range (high value density minus low value density--not film base plus fog) of 1.05 to 1.20 for enlarging (dependent on enlarger light source). Your density range of 2.53, while suspect, is certainly beyond that range.

    What I would suggest is to decrease exposure by a couple of stops and decrease your development time by an equal amount. Retest based upon that adjustment and then see what your density range is.



 

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