I bought a Canon Digital Rebel XT about a year and a half ago and have been taking pictures ever since. I still suck, but I suck much less than I used to. With enough practice, I hope to one day be a "decent" photographer. I started with the kit lens (in my defense, I didn't know any better!) and recently purchased the Canon 50mm f/1.8: some of the best $80 I've ever spent. In November and December, I'm going to be taking some trips; and I want to get a telephoto lens so I can take pictures of things that I can't get very close to (at least, not as close as I would like!). My budget is about $200 and I'm looking at the "Canon EF 75-300mm f/4-5.6 III USM" or the "Sigma 70-300mm f/4-5.6 DG APO". I know that these aren't that great and my pictures won't be as sharp as they would with more expensive glass (not to mention the low-light issues...); I've made my peace with those limitations. Does anyone have an opinion about which is the least-worst lens? Or is there a third option I don't even know about? Thanks!