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06-12-2016, 04:26 PM   #1
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Reciprocity failure

Not sure whether to best put this here or elsewhere; figured here was safest.

Does anyone out there have a correction table for reciprocity failure in Tmax 400? I have an MX loaded with the stuff, a shutter release cable and a tripod, and I'm ready to go play in the dark-ish.

Alternatively, what's a reasonable sequence of test shots by which such a chart might be determined by experiment? The best thing I can think of, looking at other films' charts, is to go with the standard reciprocal relationship at one second, then at two seconds intended shoot two and four, at four seconds intended shoot four, eight, sixteen; at eight seconds intended shoot eight, sixteen, thirty-two, sixty-four, and so on, for every planned exposure adding an extra stop of overexposure because F.O.R. tends to be nonlinear.

Naturally the actual film companies would shoot half or even quarter stop intervals to get a smoother curve, but for an amateur endeavour I think that's a good start.

06-12-2016, 04:58 PM   #2
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Not a table, but you might find this helpful:

photo technique magazine Black and White Reciprocity Departure Revisited
06-12-2016, 05:39 PM   #3
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Helpful indeed, thank you.
06-12-2016, 06:23 PM - 1 Like   #4
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Kodak includes reciprocity failure information in the technical data sheets for its products. Those are generally available online with that for TMax 400 downloadable from the URL below:

www.kodak.com/global/en/professional/support/techPubs/f4043/f4043.pdf


Steve

06-13-2016, 01:57 AM   #5
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Many thanks.
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