What do the pros use for the NFL/MLB? One of my fraternity brothers has an Uncle who shoots for the local MLB team. He said I could call his Uncle and ask to tag along to a game. I have a Cannon 50d with a 70-200mm lens. Will that work for a game or should I not even bother asking? I really want to go but if I have crappy gear, I don't want to be showed up with someones 500mm any adivce on what I should but for pro-sports?