Nikon D80 Manual page 63

Long Time-Exposures
Shutter speeds of "bulb" and "--" can be used for long time-exposure photographs of moving
lights, the stars, night scenery, or fi reworks. To prevent blurring caused by camera shake, use
a tripod and an optional remote control (
Shutter speed Description
Shutter remains open while the shutter-release button is held down.
Optional ML-L3 remote control required (
speed of "bulb, " and then select delayed remote or quick-response remote mode
(
pressed and until the button is pressed a second time or remains open for thirty
minutes.
To prevent loss of power before the exposure is complete, use a fully charged battery or an
optional AC adapter. Note that noise may be present in long exposures; before shooting,
choose On for the Long exp. NR option in the shooting menu (
38). Shutter opens when the shutter-release button on the remote control is
123) or remote cord (
123). Select mode M, choose a shutter
35 s, f/25
Reference: P, S, A, and M Modes / Mode M (Manual)
123).
83).
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