Reviews and Problems with Sigma 18-50mm F2.8-4.5 DC OS HSM
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Value for money 6
Overall quality 4
Build quality 6
Sigma AF 18-50mm f/2.8-4.5 DC HSM OS (Nikon) - Review / Test Report
30 July 2010
Conclusion: The Sigma 18-50mm f/2.8-4.5 DC OS HSM left us with mixed feelings. Physically it is no doubt a welcome step-up from Nikon's own entry-level offerings. The build quality is on a very high level for this lens class. The only issue here is the focus ring that rotates during AF. Thanks to HSM the AF itself is quiet and reasonably fast and the optical stabilization is a welcome feature even at short focal lengths.