Rudy, that's a good question, but one that doesn't have an answer likely to satisfy the clipboard folks. When subject-light-shutter combine, sometimes the photographer doesn't even know it until afterwards. On the other hand, you might have a setup in the studio or out with a field camera on a tripod where there's a lot of previewing and planning involved, and that doesn't necessarily work out. Best advice: show up and take pictures. We'll talk.