I want to buy the Canon XSI off of ebay. They are offering numerous packages with different lenses. My question is which lens is better the Sigma Zoom Telephoto 70-300mm f/4-5.6 DG Macro Autofocus Lens or the Tamron 75-300mm f/4.0-5.6 LD Zoom Telephoto Macro Autofocus Lens??
There are packages with Canon lenses, Tamron lenses and Sigma lenses, I'm just not so sure which one is best.