IMHO you will not get that much speed. Diafine is beautiful! I use it alot for my 4x5 TXP but I rate it at 400. If you want the speed, get some 3200 Kodak, rate it at 1600 and process it in D76 1:1... that is beautiful. I have done ALOT of this and I think you will be more satisfied. Cheers(posted 8399 days ago)