Nikon D810 - F5: Assign Preview Button; F6: Assign AE-L;AF-L Button

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Choose the role played by the Pv button,
either by itself (Press) or when used in
combination with the command dials
(Press + command dials). The options
available are the same as for Assign Fn
button (0 343). The default options for
Press and Press + command dials are
Preview and None, respectively.
Choose the role played by the A AE-L/
AF-L button, either by itself (Press) or
when used in combination with the
command dials (Press + command
dials). The options available are the
same as for Assign Fn button (0 343),
except that 1 step spd/aperture and
Active D-Lighting are not available. The default options for
Press and Press + command dials are AE/AF lock and None,
respectively.
f5: Assign Preview Button
G button ➜ A Custom Settings menu
f6: Assign AE-L/AF-L button
G button ➜ A Custom Settings menu