Canon EF-S 15-85 mm f/3.5-5.6 IS USM
10. Autofocus
Let move now to the accuracy of the mechanism. Here were can only say praise, as even the owners of older camera bodies like 20D/30D won’t have anything to complain about. In their case, the accuracy of the focusing mechanism is just as good as it is for 40D/50D. In both cases the number of mistakes recorded in studio conditions was about 2-5%, so small. This lack of vivid difference is not only the effect of a good lens motor, but also quite a large depth of field which is obtained at short focal lengths and mediocre brightness of the lens.
The tested lens didn’t show any tendency of front- or back-focusing both on 20D and 7D it was provided with. On 50D it showed slight back-focus, which is easily corrected via micro-regulation function.
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