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Thread: Exposure meters

  1. #1
    RJS
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    Exposure meters

    I have a Gossen Luna Pro in which I use the battery adapter sold I think by B&H. I sent it to Quality Light Metrics a while back for service. It is about 2 stops off in part of the scale. I returned it, they checked it, said it was fine. However it remains 2 stops off. (I calibrate using Dr. Richard Henry's methodology) and Quality refunded my money. Does anyone know if this is a battery problem or ?

  2. #2
    edz
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    Quote Originally Posted by RJS View Post
    I calibrate using Dr. Richard Henry's methodology
    What is that calibration methodology? I assume that Quality Light uses accepted photometric standards against a NIST reference. If it has a traceable calibration I'd normally accept it to be "correct" (to the extent that the meter can correctly measure and what it measures) and re-examine my in-house testing method.

    P.S.: The calibration is normally with the voltage as supplied. The Gossen does not have a balanced circuit and so must be calibrated with your adapter.
    Edward C. Zimmermann
    BSn R&D // http://www.nonmonotonic.net

  3. #3
    Christopher Walrath's Avatar
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    It would most definitely not be a battery problem. It sounds like either the calibration or photo cell may be damaged and is not picking up lower values properly.
    Thank you.
    CWalrath
    APUG BLIND PRINT EXCHANGE
    DE Darkroom

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