Hi - I'm researching digital cameras (either high end consumer or low-end professional) to use for theatre photography. I'm a newbie, but I'm hoping this will lead to career op's so I need something worthy of pro results. I don't enough yet to know which direction to go though. In my short experience, it's become clear that I need to be able to get good exposure under tricky lighting situations, but with a fast enough shutter speed to catch the actors. Any thoughts?