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

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F
: Long (Bulb) Exposures
You can preset the bulb exposure’s exposure time. With the bulb timer, 
you need not keep holding down the shutter button during the bulb 
exposure. This reduces camera shake.
The bulb timer can be set only in the <F> (Bulb) shooting mode. It 
cannot be set (or will not function) in any other shooting mode.
1
Select [Bulb timer].
 
Under the [z4] tab, select [Bulb 
timer
], then press <0>.
2
Select [Enable].
 
Select [Enable], then press the 
<B> button.
H
 Bulb TimerN
 
With [z3: Long exp. noise reduction], you can reduce the noise 
generated during long exposures (p.204).
 
For bulb exposures, using a tripod and bulb timer is recommended. You 
can also use mirror lockup (p.276) in combination.
 
You can also shoot bulb exposures by using Remote Switch RS-80N3 or 
Timer Remote Controller TC-80N3 (each sold separately, p.279).
 
You can also use Remote Controller RC-6 (sold separately, p.279) for 
bulb exposures. When you press the remote controller’s transmit button, 
the bulb exposure will start immediately or 2 sec. later. Press the button 
again to stop the bulb exposure.