Just looked into this some more. Fresnels seems to be the way. But another thought. The 80A filter factor would render my ASA 100 films to be shot at EI 25! That's horribly slow! I can forget shooting models basically (since I'm mostly shooting MF and would want some DOF). I would be limited to very static postures, like in old movie pics. I guess gels on the light would have the same effect, by lowering the effective light intensity?