Sigma 10-20mm f/3.5 EX DC HSM £399, $650

A high-spec, con­stant-aper­ture lens that’s dropped in price and im­proved in qual­ity over the last year

NPhoto - - Test Team -

Some four years newer than Sigma’s 10-20mm vari­able-aper­ture lens, this one used to be much more costly. In the UK the price has dropped over the last year to the point where there’s not a great dif­fer­ence be­tween the two. They look al­most iden­ti­cal, al­though the f/3.5 lens has an auto/man­ual fo­cus switch and a larger, 82mm, fil­ter thread. Build qual­ity is es­sen­tially the same, as are the speed and ac­cu­racy of the ring-type ul­tra­sonic aut­o­fo­cus sys­tem.

Sigma claims a rather wider max­i­mum an­gle of view for this lens, at 110 de­grees com­pared with the 102 de­grees of its 10-20mm f/4-5.6 lens. In our tests, how­ever, there was no dis­cernible dif­fer­ence be­tween the two. The con­stant-aper­ture de­sign is a bonus, giv­ing slightly more than a full ex­tra f/stop at the long end of the zoom range.


In the past, we weren’t bowled over by the sharp­ness of this lens: it wasn’t quite as sharp in tests as Sigma’s own f/4-5.6 op­tic. How­ever, there was a marked im­prove­ment in the new re­view lens we tested this time, which proved not only sharper than the other Sigma, but also out­classed ev­ery other lens in the group. Cor­rec­tion of colour fring­ing is an­other im­pres­sive as­pect of its im­age qual­ity.

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