Sigma 70-200mm f/2.8 EX DG OS HS M £900/$1,300

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A bit of a fair -weather friend

A cou­ple of years newer than the non-sta­bi­lized Tam­ron 70-200mm f/2.8 (left), the Sigma is a more high-tech af­fair. Up­grades in­clude rel­a­tively fast and quiet ring-type ul­tra­sonic aut­o­fo­cus and an op­ti­cal sta­bi­lizer rated at four stops, com­plete with switch­able static and pan­ning modes. Up-mar­ket glass in­cludes two FLD (Flu­o­rite­grade Low Dis­per­sion) and three SLD (Spe­cial Low Dis­per­sion) el­e­ments, along with Sigma’s Su­per Multi-Layer Coat­ing.

The lens comes with a padded soft case, tri­pod col­lar and hood, and even a hood adap­tor for greater ef­fi­ciency on DX-for­mat (APS-C) cam­eras. How­ever, the de­sign of the lens doesn’t in­clude any weather seals.

Per­for­mance

Whereas the older Tam­ron lens re­lies on a push-pull fo­cus ring for man­ual over­ride of aut­o­fo­cus, the Sigma has full-time man­ual over­ride that’s typ­i­cal of ring-type ul­tra­sonic sys­tems. Aut­o­fo­cus is no­tice­ably faster than from the Tam­ron lens as well. Im­age qual­ity is good over­all, but lev­els of sharp­ness could be bet­ter.

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