That's why I explicitly said I was working in 35mm. I know there are 2 versions of Tri-X. It does seem the "other" version may show larger differences when compared to HP5+ (which I think is the same in all formats).(posted 8675 days ago)What's a little confusing are all the "web reviews" I read where people swear either HP5+ or Tri-X is the best thing since sliced bread and that they would never consider using anything else. Since I find them so similar it's hard to understand why anyone would swear loyalty to either one - unless it's because they haven't really tested the other. I'm just wondering if I haven't hit the right conditions yet to show up their differences - or if there really aren't any to speak of.