Canon EOS RP Instruction Manual page 388

Reducing Flicker
In the < t >, < d >, or < f > mode, if the shutter speed changes during
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continuous shooting or if you shoot multiple shots of the same scene at
different shutter speeds, the color tone may become inconsistent. To avoid
inconsistent color tones, use < t >, < d >, or < f > mode at a fixed shutter
speed.
Color tone of captured images may vary between [Enable] and [Disable].
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Shutter speed, aperture, and ISO speed may change when you start shooting
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(even with AE lock).
If the subject is against a dark background or if there is a bright light in the
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image, flicker may not be properly detected.
Flicker reduction may not be possible under special lighting.
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Depending on the light source, flicker may not be detected properly.
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Depending on the light sources or shooting conditions, the expected result
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may not be obtained even if you use this function.
Taking test shots in advance is recommended.
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Detect flicker manually if the screen flickers (as when the light source
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changes) by pressing the < Q > button, selecting [Anti-flicker shoot.], then
pressing the < B > button.
Flicker is not reduced in Basic Zone modes.
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Flicker reduction also works with flash photography. However, the expected
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result may not be obtained for wireless flash photography.
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