I would not expect to blow up any 35mm negative done in PMK past 5"x7" - unless you are going for a gritty look. These days - all my 35mm is Tri-x in Microdol. Or Tech Pan. It is terrible to have a fantastic 35mm negative and only be able to enjoy it as an 8x10 - Which is not to be confused with an 8x10 contact print.