I am trying to get back into Wildlife/Landscape Photography after not having been very active with it for a while now. I've got a Canon EOS (film, not digital) that I am going to be using, atleast for a while yet. Although, I hope to move to digital as well sometime in the not to distant future. Anyways, I am looking for a new (on a budget - atleast for now) lens. I am thinking about either: Sigma Zoom Telephoto 70-300mm f/4-5.6 APO DG Macro Autofocus Lens for Canon EOS or Canon Zoom Telephoto EF 100-300mm f/4.5-5.6 USM Autofocus Lens And then maybe coupling it with a multiplier. Just wondering if anybody has used/does use either of these, and has any thoughts/recommendations/suggestions. I have read reviews on various sites, but would like some feedback from you guys as well. Thanks in advance for your feedback.