I shot with the SRT series for years, in fact my first cameras that I worked with were SRT 100 and an SRT 200...I still have several lenses that work on this body all the way from 28mm to 200mm that I could be talked out of cheap, as far as film any 35mm film will work in it, the 45mm lens that you say is on it, is a great lens to start learning with..if you have the SRT and a lens, pick up some film and start taking pictures, and keep hanging out here, you will learn real quick.