Nikon Z 5 Reference Manual page 141

❚❚ Long Time-Exposures
The camera offers two options for long time-exposures: "Bulb"
and "Time". Long time-exposures can be used for pictures of
fireworks, night scenery, the stars, or moving lights.
A 35-second exposure shot at a shutter speed of
Shutter
speed
The shutter remains open while the shutter-release button
Bulb
is held down.
The exposure starts when the shutter-release button is
Time pressed and ends when the button is pressed a second
time.
1
Keep the camera steady, for example by using a
tripod.
2
Rotate the mode dial
to M.
"Bulb" and an aperture of f/25
Description
The Mode Dial
99