Sigma 150-500 mm f/5.0-6.3 APO DG OS HSM
10. Autofocus
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The Sigma 150-500 mm was equipped with the HSM motor (Hyper Sonic Motor), which was supposed to ensure a speedy and silent focusing mechanism. It is silent indeed, but when the speed is concerned, we’ve seen quicker motors of this type – for instance one that is installed in the Sigma 70-200 mm f/2.8. Running through the scale, from 2.2 meters to infinity, takes the Sigma 150 –500 mm about 1 second and this result remains pretty much the same, no matter in what direction we move. We can additionally express a regret, that Sigma didn’t decide to use any type of autofocus control mechanism which would make it work faster.
The autofocus accuracy is difficult to fault. In studio , the lens missed in 8% of all attempts and we haven’t noticed any frontfocus or backfocus tendencies.
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