Nikon D7200 body - Manual (Page 310)

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f7 Slot empty release lock (defaults to Enable release)
Release locked Choose whether the shutter can be
released when no memory card is
inserted.
Enable release
f8 Reverse indicators (defaults to )
If ( W) is selected, the
exposure indicators in the control panel,
viewfinder, and information display are
displayed with negative values on the
left and positive values on the right.
Select
( V) to display
positive values on the left and negative
values on the right.
f9 Assign movie record button
Press + command dials
Choose the role played by the movie-
record button and command dials
during viewfinder and photo live view.
f10 Assign MB-D15 4 button (defaults to AE/AF lock)
AE/AF lock Choose the function assigned to the
A AE-L/AF-L button on the optional
MB-D15 battery pack.
AE lock only
AE lock (Hold)
AF lock only
AF-ON
FV lock
Same as camera Fn button