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

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 Setting Noise ReductionN
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For images exposed for 1 sec. or longer, noise (dots of light and 
banding) typical of long exposures can be reduced.
1
Select [Long exp. noise 
reduction].
 
Under the [z3] tab, select [Long 
exp. noise reduction
], then press 
<0>.
2
Set the desired setting.
 
Select the desired setting, then press 
<0>.
 
Auto
For exposures of 1 sec. or longer, noise reduction is performed 
automatically if noise typical of long exposures is detected. This 
[Auto] setting is effective in most cases.
 
Enable
Noise reduction is performed for all exposures of 1 sec. or longer. 
The [Enable] setting may reduce noise that cannot be detected with 
the [Auto] setting.
3
Take the picture.
 
The image will be recorded with noise 
reduction applied.
Long Exposure Noise Reduction