Reviews and Problems with Sigma APO 120-400mm F4.5-5.6 DG OS HSM
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Sigma 120-400mm f/4.5-5.6 DG OS HSM Lens Review
11 March 2011
Summary: Being priced at £675, this lens represents a good value choice for those looking for a super-telephoto lens, without the extortionate price tag associated with some camera manufacturer's own lenses in this range. For it's price, it has excellent build quality and a good range of useful features, such as Optical Stabilisation and silent focusing, but some aspects of handling could still be improved, like the looseness of the zoom mechanism.
Pros: Priced well, Good build quality, Optical Stabilisation, Silent focusing with full-time manual override
Cons: Prone to flare when used without the supplied lens hood, Loose zoom mechanism suffers with zoom creep, Hunts for focus in low light conditions