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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.
    -CW

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti



 

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