If you're into sports photography, we want to pass along some of Bill's thoughts about improving images.
In general, don't chase the picture all over the field. "Put yourself in the best position you can and wait until the action comes to you." In fact, wait until the action comes uncomfortably close—in the telephoto lens, that is. "The action should be so close that you're cutting off arms and legs in the frame," Bill says. "Shoot tight and you'll find there's greater visual impact. Try not to get a lot of sky and grass—that's not what the sport is.
"Here's how to practice: If you're used to shooting baseball with an 80-200mm zoom, commit to shooting it with a 300mm telephoto for the game, or use a tele-extender on your 80-200. Max out the lens to its tele end, even if you miss pictures because you cut off body parts. As an exercise it's like swinging a weighted bat."
Bill also suggests practice shooting. "If you've got a game at three o'clock that's important to you, go out and shoot the one o'clock game for practice. Shooting pictures is like playing a musical instrument; you can't play once a week and expect to make great music. When I was learning this craft, I used to shoot high-school football games without film in the camera on Friday nights and then really shoot the college game on Saturday and the pro game on Sunday. The high-school game was to get into the rhythm and to get used to what I'd be seeing."