Long Time-Exposures (Mode M Only) - Nikon Z 9 Reference Manual

Long Time-Exposures (Mode M Only)

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 "Bulb"
Shutter
speed
Bulb
Time
1
Keep the camera steady, for example by using a tripod.
2
Hold the I button and rotate the main command dial to select
mode M.
Exposure
138
and an aperture of f/25
The shutter remains open while the shutter-release button is
held down.
The exposure starts when the shutter-release button is
pressed and ends when the button is pressed a second time.
Description