Help! I am a volunteer band mom who tries to take photos of a high school band under stadium lights! Our next ball game is Friday night and I am stressed out! I cannot seem to get the right ISO and focus settings. I have more blurred photos than clear ones, especially when they are moving! I have a 70-300mm zoom lens (f/5.4) and I wish I could afford the 200mm f/2.8! Is there a rule of thumb for settings (ISO, AV vs TV and Program)? The Sport setting doesn't work when it gets dark and there is no way to use flash or a tripod! Am I fighting a losing battle, because it sure seems so!