Tokina AT-X 116 PRO DX II AF 11-16 mm f/2.8
10. Autofocus
When it comes to the accuracy we don’t have any serious reservations. We got the feeling that, at least partially, it is due to the large depth of field the lens offers. Photographing the test charts we observed many times how the lens slightly changed the distance scale with every new focus setting although it was firmly put in the same position all the time. Those movements were so small, though, that it would be difficult to qualify them as errors.
At shorter focal lengths the depth of field is so significant that it would be difficult to speak about any front or back focus tendencies. Still at 16 mm and by f/2.8 we noticed a slight back focus which was corrected by the micro adjustment from the level of the camera (10 units). After that correction the image looked already good. It is also worth noticing that the problem disappeared on passing to f/4.0 – firstly the depth of field became deeper, secondly, the spherical aberration moved the depth’s centre to the right place.
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