Nikon D750 DSLR Camera (Body Only) - Manual (Page 355)

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When AF-S is selected for viewfinder photography ( 0 121), this
option controls whether photographs can be taken only when
the camera is in focus (
focus priority ) or whenever the shutter-
release button is pressed ( release priority ).
Regardless of the option selected, if the in-focus indicator ( I ) is
displayed when AF-S is selected for autofocus mode, focus will
lock while the shutter-release button is pressed halfway. Focus
lock continues until the shutter is released.
a2: AF-S Priority Selection
G button
➜
A Custom Settings menu
Option Description
G
Release
Photos can be taken whenever the shutter-release
button is pressed.
F
Focus
Photos can only be taken when the in-focus indicator
(
I ) is displayed.