Tri-X in D-76 1:1 will give finer grain than HC-110 and with my set up a true EI of 400. My personal favorite, however, is Tri-X rated at EI 250, developed in Microdol-X 1:3. Based on my very unscientific visual inspection Microdol-X 1:3 gives Tri-X the finest grain.(I am referring to the 35mm version of Tri-X by the way.)(posted 8677 days ago)