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If you set this function, <G> will appear in the viewfinder when
the camera detects flicker caused by the blinking of the light source. By
default, flicker detection is set to [Show].
Select [Viewfinder display].
Under the  tab, select
[Viewfinder display], then press
Select [Flicker detection].
Select [Flicker detection], then
Select [Show], then press <0>.
Displaying the Flicker DetectionK
If you set [z3: Anti-flicker shoot.] to [Enable], you can shoot with
reduced unevenness of exposure caused by the flicker (p.154).