Lens review

Sigma 30 mm f/1.4 EX DC HSM

10. Autofocus

In this category, the differences between the lenses will occur, even taking into account the fact that with some mounts HSM motor was used, and in other it wasn’t. The lenses equipped with this mechanism, so Canon, Nikon and Olympus, work noiselessly and slightly faster than the buzzing and slower Pentax and Sony equivalents.

The common feature of Sigma in all the systems is the random autofocus work, which doesn’t depend on HSM motor’s presence at all. The number of misses, in the case of all mounts, was large. What’s interesting, the least misses (on the level of small dozen or so percents) were recorded by Sigma on 20D and K10D. The lenses of Nikon and Sony mount behaved worse, as in their case the number of misses reached 19-20%. The worst was the cooperation with Olympus E-3, as there the number of misses reached a very high level of 26%.

Fortunately, almost all Sigmas didn’t show problems with focusing in front of, or behind the correct object. Here only Canon mount was an exception, for which there was a slight front-focusing observed.

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