Nikon D500 - Manual (Page 166)

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Shutter speed lock is available in shutter-priority auto and
manual exposure modes, aperture lock in aperture-priority auto
and manual exposure modes. Shutter speed and aperture lock
are not available in programmed auto exposure mode.
1
Assign shutter speed and aperture lock to a camera control.
Assign Shutter spd & aperture lock to a control using
Custom Setting f1 (Custom control assignment,
0 301).
2
Lock shutter speed and/or aperture.
Shutter speed (exposure modes S and M)
:
Press the selected control and rotate
the main command dial until
F icons
appear in the viewfinder and control
panel.
To unlock shutter speed, press the
control and rotate the main command dial until the
F icons
disappear from the displays.
Aperture (exposure modes A and M) : Press
the selected control and rotate the
sub-command dial until
F icons
appear in the viewfinder and the
control panel.
To unlock aperture, press the control
and rotate the sub-command dial until the
F icons disappear
from the displays.
Shutter-Speed and Aperture Lock
A See Also
Use Custom Setting f3 (Shutter spd & aperture lock; 0 302) to keep
shutter speed and/or aperture locked at the selected values.