Sigma 18-50 mm f/2.8-4.5 DC OS HSM
10. Autofocus
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HSM used in Sigma 18-50 works quietly and quite fast. It takes it noticeably less than one second to go through the scale, no matter the direction – infinity to minimum focusing distance or vice versa.
Also, Sigma didn’t show any serious problems in co-operation with Nikon D200. The number of mistakes of the focusing mechanism reached only 4%, which is a really good result. There were no tendencies of front- or back-focusing.
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