Bulb: Long (Bulb) Exposures - Canon EOS-1D X Mark III Advanced User's Manual

bulb: Long (Bulb) Exposures

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. Use bulb exposures for night scenes,
fireworks, astrophotography, and other subjects requiring long exposures.
1.
Set the shooting mode to <
2.
Set the desired aperture value.
Press the <
select < >.
Watch the top LCD panel as you turn the <
>.
> button and turn the <
116
> or < > dial to
> or < > dial.