Nikon D5 User Manual page 126

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See Also
For information on using focus priority in continuous-servo AF, see
Custom Setting a1 (AF-C priority selection, 0 325). For information
on using release priority in single-servo AF, see Custom Setting a2 (AF-S
priority selection, 0 326). For information on preventing the camera
from focusing when the shutter-release button is pressed halfway, see
Custom Setting a8 (AF activation, 0 329). See Custom Setting a10
(Autofocus mode restrictions, 0 330) for information on limiting
focus-mode selection to AF-S or AF-C and f4 (Customize command dials)
> Change main/sub (0 357) for information on using the sub-
command dial to choose the focus mode. See page 48 for information
on the autofocus options available in live view or during movie
recording.
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The AF-ON Buttons
For the purpose of focusing the camera, pressing either of the AF-ON
buttons has the same effect as pressing the shutter-release button
halfway (note that the AF-ON button for vertical shooting can only be
used when the vertical shooting shutter-release button lock is
unlocked; 0 39).
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AF-ON button
AF-ON button for
vertical shooting
Vertical shooting shutter-
release button lock