Response to Pulling Delta 100 on a Contrasty Day

Actually, the contrast tends to vary with the color of the exposing light. Most conventional emulsions tend to gain about the equivalent of an N+1 level of contrast when exposed through a deep red filter. Interestingly, Kachel reported the reverse with T grain films, a lower contrast when exposed through a deep red filter. I've never seen an explanation for this effect but it is worth controlling for in developing if you expose through deep colored filters.

In response to your question, many photographers like rating their film a bit slower and pulling development a little. This moves the shadows off the toe and provides better local contrast in the shadows. Cheers, DJ

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