Tokina AT-X DX AF 16.5-135 mm f/3.5-5.6
10. Autofocus
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The Tokina hasn’t acquired an ultrasonic autofocus motor yet. We must honestly admit that its lack in the 16.5-135 mm model is not deeply felt. The mechanism buzzes during work but it is not annoying. The autofocus is quite fast – we run through the whole scale, no matter from what end, in about 0.7 second. The Tokina constructors made their work easier in two ways. Firstly, the tested lens, compared to its competitors, has a long minimum focus distance, amounting to 0.5 meter. Secondly, running through the scale demands just a 40-degree turn of the ring. On the one hand it makes the autofocus work quicker, on the other hand it makes the manual focusing rather difficult.
You can’t complain about the accuracy of the mechanism. The lens didn’t have to be micro-calibrated because of any front or back focus tendencies (you can see it in the picture below) and in studio conditions it missed in 4.5% of all cases.
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