Hey,
I'm shooting long exposures during the day (20-40 min). I'm rating fp4+ at 25 (i've got -8 stops on the lens and I'm stopped down to f45)
According to the reciprocity data I have a 2 min exposure should really be 17'21" and a 4min exposure should be 36'.
HOWEVER when I process my film using that failure curve the film is WAY over exposed. (Even bringing the dev time down to 7' in Xtol 1:3 is too much--and results in uneven developing).
So my question is this: If you rate a film lower do the reciprocity failure curves change? OR, is the curve data I have WACK?
Thanks
T
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