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Lens review

Sigma A 14 mm f/1.8 DG HSM

14 July 2017
Maciej Latałło

10. Autofocus

The Sigma A 14 mm f/1.8 DG HSM, as its name indicates, is equipped with an ultrasonic autofocus motor called the Hyper Sonic Motor. The mechanism is practically noiseless and running through the whole distance scale with confirmation of the focus takes about 0.3-0.4 of a second. It is a very good result.

Still we had an impression that, in this case, the speed was more important than accuracy. Officially the number of misses is perhaps not especially high, reaching just 5%, but the Sigma is helped with its focal length and the depth of field stemming from that value which can mask some autofocus misses pretty efficiently. During our sample shots session we also noticed instability of settings – the focus could be changed by the device from one shot to another. The resulting photos still remained sharp but the differences were noticeable.

In the case of both bodies used in our test the lens had a slight back focus tendency but it could be corrected by the microregulation of particular cameras without any problems.

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Canon 50D, f/1.8
Sigma A 14 mm f/1.8 DG HSM - Autofocus
Canon 5D MkIII, f/1.8
Sigma A 14 mm f/1.8 DG HSM - Autofocus