Sigma 10-20mm f/4-5.6 EX DC HSM £350, $430

One of the first in­de­pen­dently-made ul­tra-wide lenses for the DX for­mat, it’s still go­ing strong

NPhoto - - Test Team -

Since its launch in 2005, the Sigma 10-20mm has been a pop­u­lar op­tion. De­spite its budget price, build qual­ity feels ro­bust, and ad­vanced fea­tures in­clude ring-type ul­tra­sonic aut­o­fo­cus, with the usual full-time man­ual over­ride. Han­dling ben­e­fits from the fact that the fo­cus ring doesn’t ro­tate dur­ing aut­o­fo­cus, un­like the sim­i­larly priced Tam­ron 10-24mm lens. The de­sign fea­tures three SLD (Spe­cial Low Dis­per­sion) el­e­ments, aim­ing to re­duce chro­matic aber­ra­tions, while the min­i­mum fo­cus dis­tance of 24mm is typ­i­cal for a lens of this zoom range.

It’s slightly more com­pact and light­weight than Sigma’s 10- 20mm f/3.5 con­stant-aper­ture lens, and has a smaller, more typ­i­cal, 77mm fil­ter thread, rather than 82mm. How­ever, it’s just over an f/stop slower at the long end of the zoom range.

Per­for­mance

With its fast aut­o­fo­cus and great im­age qual­ity, this Sigma de­liv­ers very good per­for­mance. Lev­els of sharp­ness and dis­tor­tions are very sim­i­lar to some of the pricier lenses in the group, and bet­ter in some cases. As with a num­ber of lenses on test, chro­matic aber­ra­tions can be no­tice­able, es­pe­cially at the short end of the zoom range. Over­all, how­ever, the Sigma is out­stand­ing value for money.

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