Inconsistent film speeds with different film batchesgreenspun.com : LUSENET : Large format photography : One Thread
I finished most of my testing with HP-5+ to find various N-2 to N+1 with D-76 1:1. All was well untill I opened a new box of HP-5+ and tested with that. I am getting flim speeds of about 1/2 stop slower than I got with the previous box. At first I thought my exposures or processing was the variable, but I have made 4 tests, and the 1/2 stop loss is consistent. Is this normal between different batches of film?
-- William Marderness (firstname.lastname@example.org), February 09, 2000
You used to see it more with E-6 color materials, also different color balances as well. EPR in particular needed testing regularly, and I noticed that Fuji "tweaked" color response on velvia a few times, but this all seems to be a thing of the past now. Are you changing your stock solution of developer between tests?
-- Ellis Vener (email@example.com), February 09, 2000.