Isn't 35mm film base thinner than the usual 4x5 film base? That could get interesting...
It certainly doesn't feel that thin, it's definitely thicker than at least one of the types of sheet film I have, it's also not very curly. Remember this is made to get sent through high-speed motion cameras, so it has to be tear resistant or it would get shredded in the teeth of the moving parts.
~Stone | "...of course, that's just my opinion. I could be wrong."~Dennis Miller