Sigma 150-600mm f/5-6.3 DG OS HSM | C £740, $990


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One of Sigma’s brace of 150-600mm lenses, this is the more light­weight and in­ex­pen­sive C-class (Con­tem­po­rary) edi­tion. It’s essen­tially the same price as the com­pet­ing Tam­ron lens but is rather richer in fea­tures.

The ring-type ul­tra­sonic aut­o­fo­cus sys­tem adds an ex­tra MO (Man­ual Over­ride) set­ting which is use­ful in con­tin­u­ous AF mode. The op­ti­cal sta­biliser in­cludes a pan­ning mode, while cus­tom modes for fo­cus­ing and stabilisation can be ap­plied via Sigma’s op­tional USB Dock. These are then avail­able via a switch on the lens bar­rel. An­other novel fea­ture is that the zoom lock switch can be en­gaged at any marked fo­cal length in the zoom range.


The Sigma C lens gives sim­i­larly quick but not su­per­fast aut­o­fo­cus per­for­mance as the Tam­ron 150-600mm lens. Im­age qual­ity is also quite sim­i­lar on the whole, but the Sigma re­tains bet­ter sharp­ness at the long end of the zoom range, es­pe­cially when us­ing the widest avail­able aper­ture.

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