Summary: This is a great lens for landscape it produce very nice vivid colors. I did not notice any vignetting as other in the forums saying also I pick this lens over the new release Tamron 10-24mm, which wider end longer reach and faster aperture f/3.5, because of where the lens is made(not in Japan).
Summary: I'm not sure how I would rate the value if I had to pay the normal retail price for this lens, but I got a used one for $350 and I consider it a terrific value. Get consistently good shots with it, even at 11mm using a polarizer -- much less vignetting than I expected.
Summary: On the used market this lens seems to be lower priced than the Sigma 10-20mm.I got mine for $275, unable to find the Sigma for less than $350-400, or for that matter the much praised Tokinas, either 12-24mm or 11-16mm. So it all depends on how much you paid for it.
Summary: This lens is a decent alternative to the more expensive Canon and Nikon Equivalents, but at a price. Sharpness is only average and exposure accuracy is variable when you zoom. Edges are ok. This is no L or Ed lens by any means, but as long as you don't enlarge the image too much it will do fine.
Summary: Bought for real estate photography, with budget as a major consideration. I haven't regretted buying this lens at all, and aside from a tendency to underexpose a little on my EOS 10D (easily corrected on the camera) it's a great performer - solid yet light, quick and accurate to focus, and capable...
Summary: I do real estate photography and the 11 - 18 is essential for interior work. I've been using the lens for about 2 years now and like it pretty well. The major problem I have with it is color fringing along lines of high contrast.
Summary: While vacationing in San Fransisco, I realized that I needed a wide angle lens pretty desperately. I checked at four or five touristy camera shops (they all seemed kind of shady - the kind that want you to only pay cash).
Summary: I did a lot of research prior to buying this lens....comparing it to other wide angles etc. It got good ratings and I agree. I use it with my Canon 20D and it performs well. Pics are clean with no major noticable abberations.