At 12:35 AM 9/2/03, Albert wrote:
Is there a chart, magic formula, prayer, chant etc.. that I can do to find
out more?
Yes . . . the complete data sheet for the specific film in question. Each
film differs in its reciprocity failure characteristics. With color film,
it's not just exposure compensation. Each color layer in the emulsion has
its own reciprocity failure characteristics which may or may not match that
of other color layers. For this reason, most color films also require
color correction filters, usually given by filter "CC" number, and multiple
filters is the norm, not the exception. With color negative, a good
printer can compensate most if not all of the color shift provided the
exposure is decently accurate (properly compensated). With transparency,
what you shot is what you got, color shift and all.
BTW, Kodachrome 64's published reciprocity failure occurs at exposures
longer than 1/10th second. I've made exposures as long as one to two
seconds with zero exposure or color correction compensation without too
much problem. YMMV with K-64 and other films.
-- John
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