I'm doing my first HS football game Friday night, and could use a few pointers. It will also be my first time under the lights as opposed to daytime shooting. What I have to work with is a D300 and a 70-200 f/2.8 lens. I know most likely I'll be wide open, but what is an acceptable shutter speed for football? With baseball, I was trying to stay above 1/1000 sec, and that usually worked out, but I know the lighting is not great at most HS stadiums. Wish me luck!