Thanks a lot for the responses, it helped out a lot. My first attempt at shooting film is going to be a fashion show. I bought a 100 ft roll of 500 asa tuncston, because it's indoor. Another question - If I were to use this film to shoot a few seconds of shots outside the venue (in the evening light), would it be way to overexposed or messed up in any way, even if I keep the exposure really low? Since I want these shots, but don't want to waste a whole roll of 50 asa daylight on it.
Also, What effects do some other combinations make?
Thanks again for the tips!