I'm looking for an extra zoom lens for my Canon 30d. I like to try to keep the price under $200. From what I see my main choices are the Tamron AF70-300 f4-5.6 DI LD lens or the Sigma 70-300 f4-5.6 APO DG lens. Any thoughts and or opinions. I am not set on using those 2 companys. Thanks
Mike

