Because Pan F has such a short straight line section it needs much more careful exposure and dev than
some films, and sometimes a modified formula if you are working in bright scenes. A staining pyro helps brings int the highlights very nicely. I don't use pyrocat but PMK: ASA 25 / PMK 1:1: 100 / 6 min
@ 20C. Works best in softer light, or at least, not extreme brightness ranges. Pan F just won't dig deep
down in the shadows - too much toe.