In a message dated 9/4/98 2:31:56 AM Eastern Daylight Time,
red_rover@xxxxxxxxxxxxx writes:
<< I've read of reciprocity failure, where film, when taken at long
exposures, usually requires much more exposure then a meter calls for. I've
learned that my Om2s can take auto exposed pictures at lengths of up to 2
minutes, but wouldn't this be an incorrect exposure due to reciprocity?
Should I see how long the camera takes the picture and then multiply this
time for the specific film I'm using for the next shot? Thanks. >>
Your description of reciprocity failure is essentially correct. And yes, the
incredible low-light metering capabilities of the OM-2(n, S) and OM-4(T, Ti)
can lead to improperly exposed photos due to reciprocity failure.
Unfortunately there is no single formula to figure out what compensation
factor to use. It varies from film to film. To apply the compensation, I use
the exposure compensation dial on my OM-2S and OM-4. Best advice is to test
with the different types of film you use, and still bracket.
On a related note, I've read before that reciprocity failure can also occur
with extremely short exposures, such as those obtained with an electronic
flash at close distances. Has anyone ever experienced this phenomenon?
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