Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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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.

Set the Mode Dial to <F>.

 

While looking at the LCD panel or the 
viewfinder, turn the <6> or <5> 
dial.

 

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 LCD panel.

F

Elapsed exposure time

 

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.179).

 

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. If you use the bulb timer under the 
same shooting conditions, you need not keep holding down the shutter 
button completely.