I have a Sony SLT-A55 and I'm looking to improve the clarity of the pictures I take at high school football games. I'm currently using the Tamron AF 18-270mm f/3.5-6.3 PZD All-In-One Zoom Lens with Built in Motor. I take the pictures from the stands. I'm considering the below and I'm looking for input on which would be the best between the Tamron and Sigma, and then also between Macro or Telephoto Zoom. Or do you have any other suggestions, but it would have to fit the Sony. Tamron AF 70-200mm f/2.8 di LD IF Macro Lens - $769 Tamron SP 70-200MM F/2.8 DI USD Telephoto Zoom Lens - $1499 Sigma APO 70-200mm f/2.8 II EX DG HSM Macro Zoom Lens - $1199 Sigma 70-200mm f/2.8 APO EX DG HSM OS FLD Large Aperture Telephoto Zoom Lens - $1199 I also have a son that will be playing college football starting this year Would one of these lens work better for the daytime games than the Tamron that I'm currently using? Thank you!