Canon EOS-1D MARK III Instruction Manual page 50

Custom Function Settings
C,Fn ll: Image/Flash e×posuretDispJay
0: Off
1: 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.
2: On
Noise reduction is performed for all exposures 1 sec. or longer. The [On]
setting may be effective for noise that cannot be detected or reduced
with the [Auto] setting.
With setting 2, if a long exposure is made dunng Live View shooting, the
LCD monitor witl not display anything (no Live View image display) while
noise reduction _s applied. Dunng the noise reductton process, shooting is
possible. However, you will not be able to see anything sn the LCD monl[or
and in the viewfinder. Since you cannot cneck the focus and picture
composition, shooting ts not recommended during me noise reduction
process.
With setting 1 and 2, after the picture is taken, the noise reduction process
may take the same amount of time as the exposure. During the noise
_°eauctton. shooting _s stll possible as long as the maximum burst indicator
in the viewfinder shows "1" or higher.
0: Off
1: On
Reduces the noise generated in the image. Although noise reduction is
applied at all ISO speeds, it is particularly effective at high ISO speeds.
At low ISO speeds, the noise in the shadow areas is further reduced.
@ With settin; 1,the maximum bursi f0r continuous ShOoting wiii greatly
decrease.
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