Canon EOS Rebel xsi - Manual (Page 155)

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3 Custom Function SettingsN
C.Fn II: Image
C.Fn-3 Long exposure noise reduction
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.
C.Fn-4 High ISO speed noise reduction
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 setting 2, if a long exposure is made during Live View shooting, the
LCD monitor will not display anything (no Live View image display) while
noise reduction is applied.
After the picture is taken, the noise reduction process may take the same
amount of time as the exposure. You cannot take another picture until the
noise reduction process is completed.
With setting 1, the maximum burst for continuous shooting will greatly
decrease. White balance bracketing will also be disabled.
H73_09.fm Page 155 Monday, November 12, 2007 3:44 PM