I've had this wonderful lens for about eight months now and although it doesn't often pop out of my bag when I need or want a VERY wide angle The Sigma 10-20mm capture f/3.5 is unparalleled. The color and contrast it offers without post-processing is truly amazing. Every picture has a noticeable "click", even if the subject is very boring. F/3.5 is more expensive than its slower sibling, but I don't regret spending the extra money on a constant aperture. One less problem in bad light conditions. If you're shooting indoors or need fill flash, the Sigma will deliver excellent results on par with the Canon 430ex ii (just lower the wide-angle screen over the 430's built-in flash head). The autofocus is fast and accurate, and the images are sharp enough at any focal length (I mostly use 10-15mm). The Sigma is very solidly built (a bit heavy due to the excellent glass) and is also a visually appealing lens. Comes with a soft zippered pouch for safe storage when you don't need it in your bag. I don't regret this purchase at all.
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