I agree with alpha, If you are looking for black and white film I would go with the kodak t-max 100 (my personal favorite for large format zone work) very nice film to work with. As far as color films the BEST color transparency film is fuji VELVIA iso64 very low grain GREAT color (favors green eg. foliage) Most professional nature photographers use velvia. And ALWAYS, even wlith faster films, use a tripod. (yes there are exceptions) Generally, using a tripod makes me slow down a bit and take my time setting things up. I guarantee that it will help compositions at the very least. f/64 baby.