JimCee's reviews
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Sigma 17-35mm f/2.8-4 EX DG Aspherical HSM
10 out of 10 points and recommendedInexpensive, Good Quality BuildNot Constant ApertureI purchased this lens in September 2007 in a Nikon lens mount version from Amazon. I've used the lens extensively with APS-C cameras (Nikon D90 and D7000) and it performs admirably!
reviewed February 19th, 2013 (purchased for $237)
DxOMark recently tested the lens and compared it with a much more expensive Canon EF 16-35mm f/2.8 II USM lens (which costs $1,549.00 at Amazon). The Sigma lens performed very well in the comparison and held its own.
Here's the review and comparison:
http://www.dxomark.com/index.php/Publications/News/DxOMark-news/Sigma-17-35mm-F2.8-4-EX-DG-HSM-an-old-cheap-and-great-wide-angle-lens
The Sigma is a quality lens, made in Japan which won the European Photo & Imaging TIPA Award as the "Best Consumer Lens" in 2004. It's an older but very worthy lens for an FX or DX cameras.