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

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If you shoot an image with a fast shutter speed under a light source 
such as fluorescent light, the blinking of the light source causes flicker 
and the image may be vertically unevenly exposed. If continuous 
shooting is used under these conditions, uneven exposures or colors 
across the images may result. When you use this feature during 
viewfinder shooting, the camera detects the flickering frequency of the 
light source and takes the picture when the flicker causes less effect on 
exposure or color tone.
1
Select [Anti-flicker shoot.].
 
Under the [z4] tab, select [Anti-
flicker shoot.
], then press <0>.
2
Select [Enable].
3
Take the picture.
 
The image will be taken with reduced 
unevenness of exposure or color tone 
caused by the flicker.
3
 Reducing FlickerN
 
When [Enable] is set and you shoot under a flickering light source, the 
shutter-release time lag may become longer. Also, the continuous shooting 
speed may become slower, and the shooting interval may become irregular.
 
This function does not work with mirror lockup, Live View shooting, or 
movie shooting.
 
In the <d> or <f> mode, if the shutter speed changes during continuous 
shooting or if you shoot multiple shots of the same scene at different shutter 
speeds, the color tone may be inconsistent. To avoid inconsistent color 
tones, use the <s> or <a> mode at a fixed shutter speed.
 
The color tone of the captured images when [Anti-flicker shoot.] is set 
to [Enable] may look different from when [Disable] is set.
 
Flicker at a frequency other than 100 Hz or 120 Hz cannot be detected. 
Also, if the flickering frequency of the light source changes during 
continuous shooting, effects of the flicker cannot be reduced.