I was comparing prints of Pan F Plus 50 with those of Delta 100 and 400. While the Pan F 50 prints seem a bit sharper, they also have a darker tonal character. I do not think my hand-held light meter is defective, but I will know for sure when I get some more prints back. I doubt the meter is faulty. Anyway, is this the true character of Pan F Plus 50 and other slower b&w films? The Delta 100 and 400 seem brighter, and perhaps more realistic in this respect. Does one need to slightly overexpose slower b&w film?