Sigma 10mm – 20mm f/4-5.6 EX DC HSM Autofocus Zoom Lens for Canon EOS Digital SLR Cameras. Review
Incredible Lens

Reviewer Comments: I figured I should snag a super-wide to complement my Sigma 17-70 and Canon 70-200 f/4 L IS before our latest vacation (over to Europe). I thought I could find a use for it there, and it ended up on my Rebel XT most of the time. This lens rocks in most any situation you want where you need a wide view. Awesome in the Alps and in London and Paris. f/4-5.6 isn’t fast, but with the short focal range, you can handhold this in darker areas and still get sharp shots.
Images are sharp with stunning contrast and detail, focuses super-fast and silent. Controls are smooth and feel way better than even my 70-200 L(yes, that good). This lens at this price is an incredible bargain. I’ve found this lens a joy for automotive and fun candids as well. Just get it!

I don’t usually gush, but this is the cutest baby sheep I have ever seen. No joke.