Nikon D810 - Manual (Page 58)

34
A
The Standby Timer (Viewfinder Photography)
The viewfinder indicator display and control panel
shutter speed and aperture display will turn off if no
operations are performed for about six seconds, reducing
the drain on the battery.
Press the shutter-release button
halfway to reactivate the display. The length of time
before the standby timer expires automatically can be selected using
Custom Setting c2 (Standby timer, 0 319).
Exposure meters off Exposure meters on