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  1. #1

    Join Date
    Apr 2006
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    calibration of 361T Transmission Densitometer

    hi
    does this densitometer need to be calibrated to read neg densities or can you just zero it and then measure the negs. i would like to read pyro negs for a film speed test.
    thanks
    mitch
    mitch brown

  2. #2
    Don12x20's Avatar
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    Jan 2006
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    When I bought my used 361T, I presumed I could just zero and read.
    It did read, but way off compared to my other densitometes (for optical; I had no reference to compare on the UV spectra).

    I bought the reference step table and ran the calibration (you can get manual off the website).

    now the readings for standard B&W film (not pyro) match the other denistometers, and the pyro negative readings changed substantially from the first reading.

    So, the answer is....it depends. My experience indicates you ought to recalibrate.



 

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