Sigma 30 mm f/2.8 EX DN
10. Autofocus
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The Sigma 30 mm f/2.8 EX DN is equipped with a linear AF motor. According to the representatives of Sigma that motor is responsible for a delicate clatter which can be heard when you shake a lens. When the lens is attached to a body you hear nothing.
The focusing mechanism works silently and smoothly. Its speed is beyond reproach because even in bad lightening conditions you can run through the whole scale in 0.7 of a second. The accuracy of the mechanism is also flawless but it would be difficult to say whether it is a result of a significant depth of field or the accuracy of the autofocus itself; the important thing is that in studio conditions the lens didn’t miss one single time.
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