I am usually using a Canon 7D or 1D Mark III with a Sigma 70-200 f/2.8 OS. OS is off, but that lens is faster to focus than the non OS version or the Tamron version. It's also sharper.
These shots were all shot in full manual, ISO 12800; f/3.5 and a shutter of 1/500. Auto Whit Balance shot in raw because of the cycling lights.
Must have-the 70-200 f/2.8; a camera with good high ISO handling, CS6 or Lightroom for noise removal, fairly fast FPS, although the 1D III shoots too fast and I end up with wayyyy to many frames all too often.
I like the 7D for the added reach of the crop sensor. It's not much more than the 1dIII, but the 1dIII is in for servicing at this point, so it's a good thing I like the 7D a lot more than I expected to.
I REALLY feel like I need the 100-400 f/4-5.6L, but I haven't bit the bullet on it yet. I think if my main team goes to the playoffs/states I will break down and do it.
I shoot sports about 5 days a week right now and football I am shooting between 3 and 5 games a week. I also shoot Volley Ball, Soccer and swimming right now. In the winter I shoot boys and girls basketball part time, but varsity wrestling full time-my kid wrestles so I shoot all of that and take anything else I can take outside of it. Wrestling is also my first love for sports. Not WWE, real wrestling.
In the spring I shoot boys volleyball, Baseball, track, wrestling and our new semi pro football team anything else the schools throw my way. Summer I only shoot wrestling and that stops when football practice starts.
The schools themselves do not pay well at all, however I am allowed to sell the images to the kids/families throw at me as well as anything the paper sends me out on. It's not my main income and probably never could be, but I love it and it keeps me active in the schools as well as being PHENOMENAL advertising. I still have two of my own kids in high school and we've gotten custody of another placed with us. It's been a Godsend where the kids are concerned.