Sigma 105 mm f/2.8 EX DG Macro
10. Autofocus
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It is already a tradition that in the case of a Sigma without an HSM motor we must carp a bit about the autofocus work. However, our complaining will be very limited here. Firstly, the autofocus is slow and noisy – you can hear its deep whirr very well. What’s more important it missed in 13% of shots in the studio conditions. That result is perhaps not the worst but we can call it just average.
As a consolation we can add that on a Canon 20D and on a 300D the focus is set correctly and it locks onto the subject with authority. It is very important, especially for people taking photos in macro mode.
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