Sigma A 135 mm f/1.8 DG HSM
10. Autofocus
In studio conditions, where we use mainly the central autofocus point, there were almost no problems with the accuracy of the mechanism, with the number of misses never exceeding 2%. Sample shots outside were a bit a different story as I used side points of autofocus quite often. I didn’t notice any big mistakes but, with a shallow depth of field by f/1.8-2.0, even a small slip-up might be annoying. From f/2.8 upwards everything returned to norm.
As you see in photos below the Sigma didn’t have the slightest problems with any front or back focus tendencies, no matter what body we used in our test.
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Canon 50D, f/1.8 |
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Canon 5D MkIII, f/1.8 |
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