Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 191)

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3 Setting Noise Reduction
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 [ z 2 ] 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