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Nikkor 17-55 f/2.8 F-S DX vs Sigma 18-50 f/2.8 DC Photo Gallery by Miljenko Devcic at pbase.com
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Sigma 17-50mm f/2.8 EX DC OS HSM Review
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Amazon.com : Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Nikon Digital DSLR Camera - International Version (No Warranty) : Electronics
Sigma 17-50mm f2.8 vs Canon 17-55mm f2.8 and Tamron 17-50mm f2.8 | Darwin Wiggett
Canon EF-S 17-55/2.8 IS USM and Sigma 17-50/2.8 EX DC OS HSM Review - Bob Atkins Photography
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Best Bargain Lenses for Nikon - the underrated 18-70mm - In The Picture
