Why use smallest AF box?

Started Aug 3, 2014 | Questions thread
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Why use smallest AF box?
Aug 3, 2014

Most of the advice I found about using AF while shooting action said use the smallest AF box. That didn't make sense either for action or stationary subjects. Seems the largest AF box that one could place and keep on a subject (assuming one wants the whole subject in focus), or the part of the subject one wants in focus, increases the possibility of giving the AF a high contrast edge to work with. Is the advice for smallest box mainly because it's easier to keep on a moving subject?

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