Nikon D810 - Manual (Page 149)

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3
Choose a shutter speed.
While the exposure meters are on,
rotate the main command dial to
choose a shutter speed of Bulb
(A) or Time (&). The exposure
indicators do not appear when Bulb
(A) or Time (&) is selected.
4
Open the shutter.
Bulb
: After focusing, press the shutter-release button on the
camera or optional remote cord or wireless remote controller
all the way down. Keep the shutter-release button pressed
until the exposure is complete.
Time : Press the shutter-release button all the way down.
5
Close the shutter.
Bulb
: Remove your finger from the shutter-release button.
Time : Press the shutter-release button all the way down.
Bulb
Time