anna_case Posted December 22, 2002 Share Posted December 22, 2002 I cannot find anywhere the exact formula for Portra 160NC reciprocity factor. I'm shooting 4x5. I know that there is no correction needed until after 10 second exposures. And yeah there's the whole idea of making tests, but I'm hoping someone who has experience shooting this film can tell me if it's similar to the black and white reciprocity formula or completely different. Thanks so much. Link to comment Share on other sites More sharing options...
cosmo Posted December 23, 2002 Share Posted December 23, 2002 <a href="http://www.kodak.com/global/en/professional/support/techPubs/e31/e31.pdf">This document</a> from Kodak has information on all their films. For PORTRA 160NC though it seems to go from no adjustment required at 10 secs to not recommended in one jump :( ( as does <a href="http://www.usefilm.com/articles/selectcolorfilm/index.php">this page</a> Sorry I couln't be more help :( Link to comment Share on other sites More sharing options...
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