How about we use our collective wits and design/build a grafmatic style film holder? Ever since I started using them I haven't had any dust issues. They are easier to carry, much faster than the traditional film holders especialy when bracketing and I read were they tend to ahave better (at least more consistent) film flatmness. I have this idea of machined aluminium (it could just as easly be cherry, rosewood etc..) with ten septums for 4x5 (could be scaled with 5 septums @8x10 or 11x14).