dsbryant@mindspring.com
Date: 06/04/02-01:46:18 PM Z
Shannon,
I've found the charts developed by John Sexton for TMAX to be quite accurate. This includes development reduction information to reduce contrast. Using his chart will probably give you a good starting point.
Don Bryant
On Tue, 04 Jun 2002 12:49:27 -0400 Sandy King <sanking@clemson.edu> wrote:
Shannon,
Specific films may differ but as a general observation an increase in
exposure time to adjust for reciprocity failure needs to be
accompanied by a decrease in time of development to avoid too much
contrast. Good data sheets will generally suggest how much to cut
development depending on the amount of reciprocity adjustment.
I am not familiar with the requirements of poinhole photography with
regards to long exposures.
Sandy King
> I have a chart that shows reciprocity failure adjustments for various
>black and white films. This chart also suggests decreasing development
>times as exposure times increase. The reasoning is that reciprocity failure
>affects the shadow areas more than the highlight areas. Is this correct? I
>also have a pinhole time calculator that suggests INCREASING development
>times as exposure times increase. Which is correct? (Excuse the
>cross-posting if you read alt-photo-process and pinhole-discussion.)
>
>--shannon
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