I was in the same situation last year, was saving up for a 10-22mm but as a student don't have a regular income. Ended up goin for the sigma 10-20mm f/3.5 due to money. I'm sure the canon is a little better, but the sigma is very good for the money and would highly recommend. The f/4-5.6 model is even cheaper, I could easily live without the wider aperture as i use the lens for landscapes, couple of my mates use f/4-5.6 and also rate it very highly. have a quick look at my flickr if you want a look at some sample images: http://www.flickr.co...otos/jamesgill/ nearly all of the photo's taken with this lens!