So I'm going to Putnum Raceway to watch my buddy race his motorcycle in April. He wants me to try to get some good shots of him in the corners and I don't know if I'm going to have to buy a new lens to do it. I'm waiting on them to get back to me about how close to the track I can get, but the lens' that I own are in my signature. Is my 18-200 going to be enough? I can rent a 400 or something like that for the weekend, or I can buy a 70-300 if that will do the trick. Thanks for the advice guys/gals.