I have been shuffling between 4X5 HP5 and Tri-X hoping to see the difference and decide on what I want. I think I see the difference, but I don't know. Maybe I am just willing it. So I tried an experiment that could be called anecdotal. Same camera, same lens, same subject, almost the same exposure (320/400 +/- erratic shutter). Somehow HP5 is lighter? not as heavy? I don't know. The HP5 skintones looked (I know it's not a word) more marzipan-ish. The Tri-X looked, well, normal. I'm going with HP5, but I'd like to know if it just because I am stubborn and delusional, or if you can really see a difference. Something in my gut tells me that there can't be any difference.(posted 8878 days ago)Dean