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
16 September 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.