Nikon D750 User Manual page 156

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Auto-area AF
The focus point for auto-area AF is selected automatically; manual
focus-point selection is not available.
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See Also
For information on choosing when the focus point is illuminated, see
Custom Setting a5 (AF point illumination, 0 329). For information
on setting focus-point selection to "wrap around, " see Custom Setting
a6 (Focus point wrap-around, 0 330). For information on choosing
the number of focus points that can be selected using the multi
selector, see Custom Setting a7 (Number of focus points, 0 330). For
information on choosing separate focus points for vertical and
horizontal orientations, see Custom Setting a8 (Store points by
orientation, 0 331). For information on changing the role of the J
button, see Custom Setting f1 (OK button, 0 354).
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