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| p.1 #2 · 9 or 11 point AF - Question..... |
51 or 11 is your AF point selection method. You can scroll through all 51 or 11 more spaced out ones.
51,21,9 is you dynamic AF spread for focus tracking. That is the number of points surrounding the initial point you select that the AF will track away from your selected point.
I use 51 pt selection for most things with 9pt tracking.