Nikon D5 - Manual (Page 82)

60
y
3
Choose a focus mode ( 0 48).
4
Choose an AF-area mode ( 0 49).
5
Focus.
Frame the opening shot and press the
AF-ON
button to focus. Note that the
number of subjects that can be detected
in face-priority AF drops during movie
recording.
A
Focusing
Focus can also be adjusted by pressing the shutter-release button
halfway before beginning recording, or you can focus manually as
described on page 50.
AF-ON button