Nikon D500 - Manual (Page 328)

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f3 Shutter spd & aperture lock
Shutter speed lock Lock shutter speed at the value
currently selected in mode S or M, or
aperture at the value currently selected
in mode A or M.
Aperture lock
f4 Customize command dials
Reverse rotation
Choose the roles played by the main
and sub-command dials.
Change main/sub
Aperture setting
Menus and playback
Sub-dial frame advance
f5 Multi selector
(defaults to Do nothing)
Restart standby timer Choose whether using the multi
selector activates the standby timer
(
0 39).
Do nothing
f6 Release button to use dial (defaults to No)
Yes Selecting Yes allows adjustments that
are normally made by holding a button
and rotating a command dial to be
made by rotating the command dial
after the button is released. Setting
ends when the button is pressed again,
the shutter-release button is pressed
halfway, or the standby timer expires.
No