Hp5 is much smoother, and great in strong sunlight (greece, egypt) however i now use tri-x, it's grainier, harsher, but the overall visual appearance is crisper, better in the more miserable weather i find myself in the u.k. Hp5 pushed to EI 3200 in fotospeed fd30 is very impressive though, i'd only go to EI 1600 with tri-x. If you want finer grain try neopan 400. You really can't tell the difference? My tri-x shots stand out like a sore thumb, rated as per kodak's instuction's in hc-110.(posted 8742 days ago)