Canon EOS 5D Mark III Instruction Manual page 146

3 Noise Reduction SettingsN
Long Exposure Noise Reduction
Noise reduction is possible with images exposed for 1 sec. or longer.
[Auto]
For 1 sec. or longer exposures, 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 be able to reduce noise that otherwise
cannot be detected with the [Auto] setting.
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1
Select [Long exp. noise
reduction].
Under the [z3] tab, select [Long
exp. noise reduction], then press
<0>.
2
Set the desired setting.
Turn the <5> dial to select the
desired setting, then press <0>.
The setting screen closes and the
menu will reappear.
3
Take the picture.
The image will be recorded with noise
reduction applied.