I am looking to add a less expensive zoom to my lens collection. I am looking at either of the 70-300's in the Sigma or Tamron lines. I have the 70-200mm Macro on the 1D but I would like a lighter less expensive tele for the XT. The few dealers where I live only carry the Canon and Tamron lenes. Does anyone have experience with both lens. I appreciate any feedback I can get.








