Canon EOS REBEL T6S Instruction Manual page 155

Under [54: Custom Functions (C.Fn)], if you set [9: Mirror lockup] to

[1: Enable], the [Anti-flicker shoot.] setting will automatically switch to
[Disable].
If the subject is against a dark background or if there is a bright light in

the image, flicker may not be detected.
Under certain special types of lighting, the camera may not be able to

reduce the effects of the flicker even when <
Depending on the light source, flicker may not be detected properly.

If you recompose a shot, <

intermittently.
Depending on the light sources or shooting conditions, expected result

may not be obtained even if you use this function.
Taking test shots is recommended.

If < G > is not displayed in the viewfinder, under [52: Viewfinder

display], set [Flicker detection] to [Show] (p.72). When the camera
reduces the effects of the flicker when you shoot, <
Under a light source which does not flicker, or if no flicker is detected,
< G > will not be displayed.
If [Flicker detection] is set to [Show] and [Anti-flicker shoot.] is set to

[Disable], metering under a flickering light source will cause
< G > to blink in the viewfinder as a warning. Setting [Enable]
before shooting is recommended.
In Basic Zone modes, <

of flicker will be reduced when you shoot.
Anti-flicker shooting also works with flash. However, the expected result

may not be obtained during wireless flash shooting.
G > may appear and disappear
G > will not be displayed, but the effects
3 Reducing FlickerK
G > is displayed.
G > will light.
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