Ok I have the Canon Rebel Xsi with the kit lens at the moment. However I am leaning towards more macro photography and wildlife. I am already planning on getting a Manfrotto 190XDB Tripod and was thinking about the Sigma 70-300mm f/4-5.6 DG APO Macro Telephoto Zoom Lens, its running around 200 dollars which is about the price range I am lookin for. I would like to upgrade later on to a better lens but for now I am wondering if this is a good enough lens to get into this kind of photography and learn with. Anybody have experience with this lens?