It depends on the contrast of the eye area vs. other areas; if the eye has contrasty features, and background or other parts of the subject are not competing with it, this is what happens, ie. it favours the best focus target within the dynamic area if primary point is not on a good target. I guess the quality of the focus target is what one could call it. Anyway, I would expect that the lighting and animal species affect the performance, but also other factors such as technique.
Jul 02, 2017 at 12:45 PM
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