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 Review
30 September 2014
Conclusion: While no lens of this power is going to be compact, the Sigma is as light and short as you could reasonably expect. Like any long, weighty telephoto, ideally you would always combine this lens with the stability of a support. This isn’t always practical, though, particularly when shooting wildlife. Thankfully, due to the effectiveness of the OS technology, this is a lens you can confidently use handheld at two or three stops slower than would otherwise be possible.
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