I bought it along with my Canon 30D. My overall impression is that it is very inconsistent. It's definitely soft when full open (i.e. F3.5 or 5.6) but gets better around F8. I've got very mixed feelings about the lense at this point. In order to get results that I want I'm definitely going with F8 or so on all shots. I know it's a 3rd party lense and not the top of line optics by any means, but it so far has been a disappointment, at least when shooting near the wide open mark.