I use exclusively TMY-2 in 120 (xtol straight), and TMX in 4x5 (xtol 1:1). I like TMY-2 so much I'm considering uising it for 4x5 as well. In the past, I used tri-x in 35mm and 120. I find the gradation and tonality of TMY-2 much more pleasing to my eye than tri-x. (I don't shoot black and white in 35mm anymore)
