Nikon D800 - Manual (Page 151)

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127
Z
Aperture (exposure modes g and h) : Press the selected button and
rotate the sub-command dial until F icons appear in the
viewfinder and the control panel.
To unlock aperture, press the button and rotate the sub-
command dial until the
F icons disappear from the displays.
A
See Also
Use Custom Setting f7 (Shutter spd & aperture lock; 0 316) to keep
shutter speed and/or aperture locked at the selected values.
Fn button Sub-command dial