As another mentioned, if you do nothing else, stay far away from the EF 75-300 mm f/4-5.6 III. Personally I don't think it competes for lemon of them all, but it actually wins the title. It's so mediocre that many sites don't even review it as the demand for it is low. Only the most dedicated of sites has done so. Bryan has a review you might want to peruse. I can understand that the price is attractive but you will be better off saving the cash towards something a little better. Sometimes there's a good reason things are cheap, and I don't mean just inexpensive.