Nikon D800 - Manual (Page 343)

En_03
319
U
Selecting Enable release allows the shutter to be released when
no memory card is inserted, although no pictures will be recorded
(they will however be displayed in the monitor in demo mode). If
Release locked is selected, the shutter-release button is only
enabled when a memory card is inserted in the camera.
If 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
to display positive values on the left and
negative values on the right.
f11: Slot Empty Release Lock
G button ➜ A Custom Settings menu
f12: Reverse Indicators
G button ➜ A Custom Settings menu