Sigma 17-70mm f/2.8-4 DC Macro OS HS M | C £350/$500

Newer and smaller, but with a big­ger zoom range

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The newer of Sigma’s DX-for­mat lenses on test, this one is a ‘Con­tem­po­rary’ class model from Sigma’s ‘Global Vi­sion’ line-up. As such, it’s de­signed to be com­pact, light­weight and stylish. It lacks the older Sigma lens’s con­stant-aper­ture rat­ing, but matches its f/2.8 rat­ing at the short end of the zoom range, while only shrink­ing to f/4 at the long end. That’s still an f/stop faster than most kit lenses.

As with the Sigma 17-50mm lens, aut­o­fo­cus is based on an ul­tra­sonic mo­tor, and the fo­cus ring ro­tates dur­ing aut­o­fo­cus, so you have to be care­ful to keep your fin­gers clear. Other sim­i­lar­i­ties are the in­clu­sion of two FLD el­e­ments and a four-stop op­ti­cal sta­bi­lizer.

Per­for­mance

Lab test re­sults for cen­tre­sharp­ness aren’t quite as good as from the Sigma 17-50mm, but lev­els of sharp­ness are much more con­sis­tent across the whole im­age frame. There’s less colour fring­ing at mid to long zoom set­tings, and pin­cush­ion dis­tor­tion at the long end is barely any worse, de­spite the ex­tra tele­photo reach.

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