Nikon D4 - Manual (Page 157)

131
Z
Long Time-Exposures
At a shutter speed of A, the shutter will remain open while the
shutter-release button is held down. Use for long time-exposure
photographs of moving lights, the stars, night scenery, or
fireworks. A tripod and optional remote cord (
0 394) are
recommended to prevent blur.
1
Ready the camera.
Mount the camera on a tripod or place it on a stable, level
surface. If you are using an optional remote cord, attach it to
the camera.
Shutter speed: 35 s; aperture: f/25
A
Long Time-Exposures
Close the viewfinder eyepiece shutter to prevent light entering via
the viewfinder from appearing in the photograph or interfering
with exposure (
0 114). Nikon recommends using a fully charged
EN-EL18 battery or an optional EH-6b AC adapter and EP-6 power
connector to prevent loss of power while the shutter is open. Note
that noise (bright spots, randomly-spaced bright pixels or fog) may
be present in long exposures; before shooting, choose On for the
Long exposure NR option in the shooting menu (
0 302).