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Lens review

Sigma A 35 mm f/1.4 DG HSM

12 December 2012
Szymon Starczewski

10. Autofocus

The Sigma A 35 mm f/1.4 DG HSM, as its name indicates, is equipped with an ultrasonic autofocus motor. Because of that the focusing mechanism works noiselessly – the only thing you can hear is a whirr of shifting elements.

When it comes to the speed it depends on the working conditions - if there is not much light running through the whole distance scale can take even 1 second. When it is lighter that time shortens to 0.6-0.7 of a second. What’s interesting, the expensive Nikkor 1.4/35 didn’t fare better here. Actually the elderly Canon 35L, which can be even two times faster that the Sigma or the Nikkor, remains an example to be followed.

We don’t have any reservations about the accuracy of the autofocus. The number of misses in studio conditions reached 2.5% which is a very good result. On both bodies, used in the test (the 50D and the 1Ds MkIII) we haven’t noticed any back or front focus tendency which can be also observed in sample photos below.

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Sigma A 35 mm f/1.4 DG HSM - Autofocus

Sigma A 35 mm f/1.4 DG HSM - Autofocus