Nikon D780 DSLR Camera (Body Only) - Manual (Page 218)

172 Shooting Settings
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 : After focusing, press the shutter-release button all
the way down.
5
Close the shutter.
• Bulb : Take your finger off the shutter-release button.
• Time : Press the shutter-release button all the way down.
A Long Time-Exposures
To prevent light entering via the viewfinder from appearing in the
photograph or interfering with exposure, we recommend that you
remove the rubber eyecup and cover the viewfinder with the supplied
eyepiece cap (
0 10). Nikon recommends using a fully charged battery or
an optional AC adapter and 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. Bright spots and
fog can be reduced by choosing [
On ] for [ Long exposure NR ] in the
photo shooting menu.