Hello! One good combination I know is Tri-X exposed at 200 Asa, developed in Microdol-X 1+3, 10 - 10,5 minutes at 75 F (24 C). It will give you very fine grain and a good soft contrast for portraits.(posted 8691 days ago)Paterson Aculux 2 will also give very fine grain with Tri-X and you will not lose any speed with this developer. For softer results you can expose at 320 Asa and develop a little shorter time than recomended.