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  1. #11
    Rodex's Avatar
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    May 2010
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    Friesland, The Netherlands
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    Quote Originally Posted by jon.oman View Post

    The interesting thing about this image, is that it took 9 HOURS to expose! A problem with reciprocity of the Tri-X 320 film I was using.

    Jon
    How did you find out what the exposure time was?

  2. #12

    Join Date
    Nov 2008
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    Quote Originally Posted by Rodex View Post
    How did you find out what the exposure time was?
    I found this link:

    http://pinhole.stanford.edu/equations.html

    Towards the bottom of the page is "Reciprocity Calculations". I used the one for Tri-X.

    With the formula in hand, I wrote a small Java program to generate an exposure chart. The chart contains the indicated (metered) exposure (1 second, 2 seconds, etc.) and the reciprocity exposure time.

    Jon

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