Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Canon Digital SLR Cameras

I used this lens for 1 week and took over a 200 photos in various shutter speed/aperture combinations; all of them turned out so-so to no good. The center sharpness is ok, but the sharpness and distortion of the image becomes unacceptable, starting about half-way to the image edge.

I don't believe I received a bad copy of this lens as a previous reviewer had as I didn't find one side of the image to be better or worse than the other and the autofocus seemed to be on target.

SAVE A FEW HUNDRED DOLLARS, GET THIS INSTEAD OF THE 10-22 BY CANON, CANON IS THE BETTER OF THE TWO, BUT, NOT FOR THE MONEY, IF YOU HAVE LENS FEVER! THANKS, SIGMA.

I bought this lens because it was cheaper than the Canon version, and won an award in europe for the best consumer lens of it's kind. I use it with my Canon 30D digital SLR. It's very sharp, and feels great when shooting. Great Wide angle is you don't have one. Please note that this lens will ONLY work with a corresponding DIGITAL SLR.

This is my first "real lens". the Sigma EX line is a good place to start getting into quality glass. I was looking for something of a fisheye (maybe not that extreme) but definitely something wiiiiide.

This fits the bill very well. It is not the most extreme angle but it really captures depth/space in the frame and creates an interesting look. You'll learn to be aware of your entire environment as the wide angle can capture things on the extreme periphery. It makes scenes more lively, i had my sister shoot with this lens at a wedding reception with some very entertaining results.

Only concern is that this is an f4 lens compared to Canon's L series wide lenses that hover around f2.8. But then you'll spend over twice as much!

Sigma continues to impress me. My one pricey Canon-brand lens (28-70 f/2.8 L) has color-fringe problems, and my two Sigmas (this one and the very sweet APO 70-200 f/2.8 EX DG HSM) are dead-on correct and free of chromatic aberration. My chief complaints about this lens are fairly irrelevant since they center around its inherent design:

1) variable aperture (makes you have to change your flash settings if you shoot manual)
2) it's not a f/2.8 lens

I was aware of these design specifications (not issues or surprises) before buying and am pleased with it despite them. That's the tradeoff you get for a great price.

It's nice to have a true wide-angle lens back in my arsenal, since the 28-70 combines with my 1.6x sensor size factor to become a 45-112, hardly wide.

To anyone considering buying the lens, just be aware that it's not for full-frame cameras. If you don't know what this means, or aren't sure what yours is, read the manual.

The field of view is an immense 102° side-to-side, and it focuses down to about 6" from the subject at 10mm.