Sigma A 28 mm f/1.4 DG HSM review - Autofocus

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Sigma A 28 mm f/1.4 DG HSM

21 January 2019

Arkadiusz Olech

10. Autofocus

The autofocus of the tested Sigma is noiseless but it would be difficult to call it very quick. Running through the whole distance range and setting the focus takes about 0.7–0.8 of a second, a decent result but also one which could have been better especially if you talk about a lens that might be used in journalistic photography for example. The speed didn’t change, no matter to what body we attached the lens to, remaining very similar both for the 50D and the 5D Mark III.

When it comes to the accuracy of the mechanism we didn’t have any serious reasons to complain. In studio conditions and during our sample shots session the number of misses didn’t exceed 3–4%.

We didn’t experience any problems with front or back focus tendencies. After looking at images below you see clearly that, when attached to the 5D Mark III, the Sigma didn’t need any calibration and while cooperating with the 50D it showed a very slight back focus which might bother you only if you take photos from the minimum focusing distance.

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