Nikon D750 DSLR Camera (Body Only) - Manual (Page 155)

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Focus Point Selection
The camera offers a choice of 51 focus points that can be used to
compose photographs with the main subject positioned almost
anywhere in the frame. Follow the steps below to choose the
focus point (in group-area AF, you can follow these steps to
choose a group of focus points).
1
Rotate the focus selector
lock to
●
.
This allows the multi
selector to be used to
select the focus point.
2
Select the focus point.
Use the multi selector to select the
focus point in the viewfinder while the
exposure meters are on. Press
J to
select the center focus point.
The focus selector lock can
be rotated to the locked (
L )
position following
selection to prevent the
selected focus point from
changing when the multi
selector is pressed.
Focus selector lock