John,(posted 8823 days ago)PMK is an extraordinary developer with any format. It is a little more work than standard developers but its worth it. Pyro developers such as PMK guard highlights better than any standard developer. The tonal range is much longer and negatives are easier to print. You will see the difference more dramatically with high contrast scenes and films in the lower ASA range. If you insist on a standard developer, Use Kodak X-tol for high speed films like tri x and hp5. Even Kodak rates X-tol superior to all of it's other developers in every catagory. Even the author of the Book of Pyro, Hutchings, writes about using PMK with 35mm format.
Good Luck