Nikon D810 - Manual (Page 147)

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Select the following shutter speeds for long time-exposures of
moving lights, the stars, night scenery, or fireworks.
• Bulb (
A): The shutter remains open while the shutter-
release button is held down. To prevent blur, use a tripod or an
optional wireless remote controller (0 441) or remote cord
(0 439).
• Time ( &): Start the exposure by using the shutter-release
button on the camera or on an optional remote cord, or
wireless remote controller. The shutter remains open until the
button is pressed a second time.
Long Time-Exposures ( h Mode Only)
Length of exposure: 35 s
Aperture: f/25