Looking for a new lens to capture some photos of my son playing football on friday nights. I know the next 4 years will go by pretty quick, so I hope to catch some action shots. I have a Canon EOS 60D and need more reach than my 135mm will give. I don't have the cash for a "L" series lens from Canon, so I'm looking at the cheaper Canon's, Tamron and Sigma. Any suggestions?
