"What I'm interested in is to understand why some of you will shoot Pan F Plus at iso 25 rather than at iso 50 ? I just can't get to understand why ! "(posted 8152 days ago)Eric, my experience is that according to my taste the B/W films are almost ALWAYS overrated by manufacturer by 1-2 stops (Delta 100 and TMAx 100 seem to be the only exception), and suggested development times give too high contrast. When I try a new film my usuas practice is to expose the film at half of its speed (e.i. overexpose by 1 stop compared to mfc recommendations) and reduce the development time by 20-50%. This is MY starting point. The rest depends on further testing, scene brightness range etc.