Nikon D800 User Manual (en)

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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 (
0 389) 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. Nikon recommends using a fully charged EN-EL15 
battery or an optional EH-5b AC adapter and EP-5B 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 (