Canon EF 50 mm f/1.4 USM
10. Autofocus
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It is obvious that there’s an USM motor inside. The focusing is quite fast, pretty silent and its accuracy level is acceptable. The number of misses for the studio charts didn’t exceed 9% - not bad for the 20D body. Apart from that, the sharpness in most of the cases was set in the right place so neither before nor after the given subject. The picture below shows it quite well.
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Only the 1Ds MkIII showed us what a significance of a good body in this category is. When testing a lens I always take about 5-8 shots at every aperture using the autofocus and then additionally I take several to over a dozen pictures focusing manually; it allows to present and assess the real lens’s performance on the graph, omitting any autofocus errors. Here, at the maximum relative aperture all the pictures, taken with the autofocus on, were more or less better than those, taken with manual focusing. Overall, after considering all photos taken with the help of the 1Ds MkIII on all testing charts, the number of misses didn’t exceed a negligible level of 2%.
