Does Van Dyke reach a point where there is reciprocity failure with long
exposures?
Mark Nelson
Precision Digital Negatives
In a message dated 11/23/05 12:07:10 AM, mkochsch@shaw.ca writes:
> What I was trying to do was to see what the limits of a colorized negative
> are in regards to blocking UV. I'm normally printing to VDB around 1.8-1.95
> which takes about six minutes. For my own curiousity I doubled that time,
> and then doubled that again (6, 12, 24 minutes). At 24 minutes things
> weren't looking like what I thought they would. I wondered if heat energy
> was becoming a factor on the emulsion exposure overall. Hence the question,
> does heat fog exist in these situations?
>
Received on Wed Nov 23 02:54:42 2005
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