Sigma A 24-35 mm f/2.0 DG HSM
10. Autofocus
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The tested lens is equipped with an HSM ultrasonic autofocus motor so the focusing mechanism is noiseless. The lens is perhaps not the fastest one around but still it performs decently well. Running through the whole distance scale and confirming the focus takes about 0.7-0.8 of a second, no matter what conditions and what focal length you employ.
When it comes to the accuracy the lens performed as it should with the standard settings. All photos taken in studio conditions were properly sharp. In the case of the 5D MkIII the Sigma didn’t need any calibration. With the lens attached to the EOS 50D we observed a very slight front focus.
| 50D, 35 mm, f/2.0 |
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| 5D MkIII, 35 mm, f/2.0 |
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