Reviews and Problems with Sigma APO 120-400mm F4.5-5.6 DG OS HSM
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Value for money 7
Overall quality 4
Build quality 8
Sigma AF 120-400mm f/4.5-5.6 DG HSM OS - Full Format Review / Lab Test Report
22 June 2010
Conclusion: The Sigma AF 120-400mm f/4.5-5.6 DG HSM OS is a consumer grade tele zoom lens with a relatively decent albeit not spectacular performance. The resolution figures are generally fine in the image center whereas the borders/corners are just soso in the lower part of the zoom range. That said the border/corner performance is, of course, not overly relevant for such a lens so you may forgive this weakness.