Nikon D4 - Manual (Page 45)

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Autofocus Tips
Focus Point Selection and Camera Orientation
When Yes is selected for Custom Setting a10 (Store points
by orientation), separate focus points can be selected for
“wide” (landscape) orientation and for “tall” (portrait) ori-
entation (camera rotated 90° clockwise or counterclock-
wise).
If No is selected, the same focus point will be used regard-
less of camera orientation.
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