I am kinda new to the world of Photography. I have a Canon 400D with the basic kit lens EFS 18-55m. Which really just doesnt do it for me. Canon of course makes some great lenses. But I notice that Sigma makes comparable lenses that dont quite cost as much as the Canon lenses. Now I am willing to spend more money on a 'for sure' higher quality lens, but I was wondering how decent Sigma lenses are and what peoples opinions are on them. Thanks for the help!