Canon EF 50 mm f/1.8 STM
10. Autofocus
We were very happy with the accuracy of the mechanism for a change. In studio conditions it didn’t miss one single time. In order to check that performance thoroughly by f/2.8 we took 50 photos of our resolution testing chart, every time setting the focus anew. The worst result in the series was 1917 LWPH, and the best reached 2120 LWPH; the median amounted to 2034 LWPH. The maximum differences reach 10% at most so the performance of the focusing mechanism should be assessed in a very positive way.
In this category the new lens simply knocked out the older model which autofocus was not only noisy but also had noticeable repeatability problems.
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When it comes to front or back focus tendencies we didn’t notice any problems either.
50D, f/1.8 |
5D Mk III, f/1.8 |