Sigma 10-20mm f/3.5 EX DC HSM £330, $450

High-end fea­tures come at a bar­gain price

NPhoto - - Gear Zone The Big Test -

Per­for­mance

The aut­o­fo­cus sys­tem is quick and quiet, and im­age qual­ity is boosted by the in­clu­sion of one SLD (Spe­cial Low Dis­per­sion) and two ELD (Ex­tra­or­di­nary Low Dis­per­sion) el­e­ments. These help to main­tain good sharp­ness and con­trast, while keep­ing colour fring­ing low. Un­der­cut­ting the Tam­ron 10-24mm for price, the Sigma doesn’t stretch as far in terms of zoom range, but has pretty much the same max­i­mum view­ing angle. Build qual­ity feels bet­ter in the Sigma, and higher-end fea­tures in­clude a ring-type ul­tra­sonic aut­o­fo­cus sys­tem. This im­proves han­dling, as the fo­cus ring doesn’t ro­tate dur­ing aut­o­fo­cus­ing, while also adding the bonus of full-time man­ual over­ride.

Another fea­ture that’s unique among the DX-for­mat lenses on test is the con­stant-aper­ture de­sign. The Nikon and Tam­ron 10-24mm lenses match the Sigma’s f/3.5 rat­ing at the short end of the zoom range, but it is two-thirds of an f-stop faster at the long end, as the other two lenses shrink to f/4.5.

DX

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