Nikon D5 - Manual (Page 67)

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Choose whether the shutter-release button can be used to focus
(Shutter/AF-ON) or if focus can only be adjusted using the AF-ON
button or other controls to which AF-ON has been assigned
(AF-ON only). Highlighting AF-ON only and pressing
2 displays
an Out-of-focus release option; select Enable to allow pictures to
be taken without focusing, or Disable to prevent the shutter being
released before the camera has been focused using the AF-ON
control. To take pictures when Disable is selected, use the AF-ON
control to focus and press the shutter-release button all the way
down to release the shutter. Note that Disable only applies if
Focus is selected for Custom Setting a1 (AF-C priority selection)
or a2 (AF-S priority selection) and an option other than auto-area
AF is selected for AF-area mode.
Choose the AF-area modes that can be
selected using the AF-mode button and sub-
command dial in viewfinder photography
(live view is unaffected). Highlight the desired
modes and press
2 to select or deselect.
Press J to save changes when settings are
complete.
a8: AF Activation
G button
➜ A Custom Settings menu
a9: Limit AF-Area Mode
Selection
G button
➜ A Custom Settings menu