I am looking for a flash meter to use with studio lights. I'm getting a little confused about how they actually work. I have read that shutter speed is irrelevant, and that the meter will tell you which aperture to use. How can shutter speed be irrelevant? I want to measure light from the strobe using an incident meter rather than reflected light meter. What is the advantage of using a spot meter? Should I consider the Minolta VI all in one or some equivalent? Should I just use digital or polaroid to get a correct exposure, then use the settings on film? What does everyone else do?