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In Phils book there is a very detailed section about conduction reciprocity tests. In my case I did not feel like doing them and/or spending a lot of money on ND filters so I kind of winged it. Look at the files in the plotter program that Phil supplies and choose an old style film, something like FP4 and use that to start and then take some pictures and adjust the factor according to the following directions Phil sent to me.
"The letter component describes exposure compensation; "A" providing the least,
and "E" the most. The number component describes development compensation; "5"
leaves development unchanged, "6" decreases development a little, "7" decreases
it more. "4" increases development, "3" and "2" increase it more, and "1"
increases it most."
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