Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 246)

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In this mode, the shutter stays open as long as you hold down the
shutter button completely, and closes when you let go of the shutter
button. This photographic technique is called “bulb exposure”. Use bulb
exposures for night scenes, fireworks, the heavens, and other subjects
requiring long exposures.
1
Set the shooting mode to .
Press the < W > button and turn
the < 6 > or < 5 > dial to select
< buLb >.
2
Set the desired aperture.
While looking at the top LCD panel,
turn the <
6 > or < 5 > dial.
3
Take the picture.
The exposure will continue for as long
as you keep the shutter button
pressed completely.
X The elapsed exposure time will be
displayed on the top LCD panel.
1: min., 2: sec., 3: hour
bulb: Bulb Exposures
(1) (3) (2)
Do not point the camera toward an intense light source, such as the sun
or an intense artificial light source. Doing so may damage the image
sensor or the camera’s internal components.
Long exposures produce more noise than usual.
If ISO Auto is set, the ISO speed will be ISO 400 (p.165).
For a bulb exposure, if you use both the self-timer and mirror lockup
instead of the bulb timer, keep pressing the shutter button completely
(self-timer delay time + bulb exposure time). If you let go of the shutter
button during the self-timer countdown, there will be a shutter-release
sound, but no picture will be taken.