Nikon D810 - Manual (Page 330)

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When AF-C is selected for viewfinder photography (0 87), this
option controls whether photographs can be taken whenever
the shutter-release button is pressed (release priority) or only
when the camera is in focus (focus priority).
Regardless of the option selected, focus will not lock when AF-C is
selected for autofocus mode. The camera will continue to adjust
focus until the shutter is released.
a: Autofocus
a1: AF-C Priority Selection
G
button ➜ A Custom Settings menu
Option Description
G
Release
Photos can be taken whenever the shutter-release
button is pressed.
E
Release +
focus
Photos can be taken even when the camera is not in
focus. In continuous mode, frame rate slows for
improved focus if the subject is dark or low contrast.
F
Focus
Photos can only be taken when the in-focus indicator
(I) is displayed.