Reviews and Problems with Sigma 18-50mm F2.8 EX DC MACRO /HSM
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Value for money 9
Overall quality 6
Build quality 7
Sigma AF 18-50mm f/2.8 EX DC macro - Review / Lab Test Report
31 January 2008
Conclusion: Generally the Sigma AF 18-50mm f/2.8 EX DC macro delivered a solid performance but without being any better than the competition. The resolution results are generally very fine except at 18mm where the extreme border performance leaves something to be desired below f/5.6. Distortions as well as CAs are about in line with the rest of the gang. Typical for most dedicated APS-C lenses the vignetting could be a little better at wide-open aperture.