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Sigma 10-20mm F4-5.6 EX DC HSM

Review Date: Jun 28, 2010 Recommend? yes | Price paid: Not Indicated | Rating: 6 

Pros: Price, angle-of-view, zoom range, build quality, finish, size, fixed stupid lens-cap
IQ in corners, focusing

Have had mine for 4 days and still uncertain whether I have a good/average/bad copy.

Looks OK in centre at any aperture, but corners are disappointing, particularly the left hand side.

AF seems like a hit'n'miss affair, at least with my Nikon D90.

Should I try and exchange for another copy? Sample plus 100% crops from corners here:
1/160 at f8.0, ISO200. EXIF says focus point was 2m which should get me from 0.5m to infinity DOF (according to

Good news is Sigma have finally fixed the stupid lens-cap issue: it is now center-pinch.