Andrew O'Neill
Moderator
With any film that I am trying for the first time, I like to run a few tests with it before venturing out in the field. The last test I do is for reciprocity correction. I use Phil Davis' method which is outlined in his book, Beyond The Zone System.
Fuji states that an additional half stop exposure is required for exposures from 120 to 1000 seconds. Nothing is needed before that. My results pretty much jive with theirs. 100 seconds and 1000 seconds both only require 1/2 stop (although my data indicated 2/3 stop..but close enough!). This was hard for me to wrap my head around, but curves don't lie. I'll go out in the yard tomorrow and shoot a couple of sheets. One at a shutter speed that is well out of reciprocity territory, and the other at 120 seconds (or longer!) and compare the two. I develop in Pyrocat-HD 1+1+100, 17:00, 21C, tubes.
Fuji states that an additional half stop exposure is required for exposures from 120 to 1000 seconds. Nothing is needed before that. My results pretty much jive with theirs. 100 seconds and 1000 seconds both only require 1/2 stop (although my data indicated 2/3 stop..but close enough!). This was hard for me to wrap my head around, but curves don't lie. I'll go out in the yard tomorrow and shoot a couple of sheets. One at a shutter speed that is well out of reciprocity territory, and the other at 120 seconds (or longer!) and compare the two. I develop in Pyrocat-HD 1+1+100, 17:00, 21C, tubes.
