Sigma 150 mm f/2.8 EX DG HSM APO Macro
10. Autofocus
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In the case of autofocus mechanism we always try to asses the speed, the level of noise, its accuracy and whether or not it shows any front or back focus tendencies. When it comes to these categories the Sigma 2.8/150 equipped with an HSM motor achieved a very good result three times out of four. Its autofocus works very silently and quickly and, what is not so often for Sigma lenses, it doesn’t have even a trace of front or back focus.
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The focusing accuracy, though, can be called a serious slip-up – the lens missed in 20% of all shots on our test charts.
