Sigma 17-50mm f/2.8 EX DC OS HSM review

The Sigma 17-50mm f/2.8 EX DC OS HSM brings a fast, constant aperture to APS-C format standard zooms

Sigma 17-50mm f/2.8 EX DC OS HSM
(Image: © Sigma Imaging)

Digital Camera World Verdict

Most of us are content with the standard zoom lens that we probably bought as part of a kit with out APS-C format DSLR. Handling and image quality are usually very convincing but one thing you generally won’t get is a fast f/2.8 aperture that remains constant throughout the zoom range. That’s the main attraction of this Sigma lens but handling and image quality could be better. It’s now disappeared from retailers’ shelves but makes a very affordable used buy.


  • +

    Fast, constant f/2.8 aperture

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    Decent build quality

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    Affordable purchase price


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    Focus ring rotates during AF

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    No full-time manual AF override

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    No weather-seals

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At a glance, the Sigma 17-50mm f/2.8 EX DC OS HSM appears to offer most of the same advantages as its Canon and Nikon APS-C format f/2.8 counterparts, but at less than half the price. It features optical stabilization as well as having an aperture rating of f/2.8 that remains constant throughout the zoom range. It’s quite small and lightweight, and feels pretty robust, but the main difference lies beneath the skin.


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Matthew Richards

Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners! 

His expertise with equipment doesn’t end there, though. He is also an encyclopedia  when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related. 

In an earlier life he was a broadcast engineer at the BBC, as well as a former editor of PC Guide.