I'm thinking of going into film photography, but the problem is, I know absolutely nothing about film. I've used compact 35mm cameras in the past for happy snaps, and that's about it. I'd like to do mostly landscape and outdoor portraits, with large-size prints (A2 and A3 sized). Will a regular SLR camera do, or do I need those medium format cameras? When buying a film SLR camera, what are the technical features I should be looking for? Also, I've been reading about using slides instead of film. Can slides be used with most regular 35mm SLRs?