Canon EOS RP Instruction Manual page 300

Cautions for the <SCN> Modes
6 : Night Portrait
Tell subjects to remain still for a moment after the flash fires.
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Focusing may be difficult when subject faces look dark. In this case, set the
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lens's focus mode switch to <MF> and focus manually.
Autofocusing at night or in dark scenes may be difficult when points of light lie
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within the AF point. In this case, set the lens's focus mode switch to <MF> and
focus manually.
Shots will look slightly different from the image as displayed on the screen.
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F : Handheld Night Scene
Compared to other shooting modes, the image area will be smaller.
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RAW image quality cannot be set.
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Autofocusing at night or in dark scenes may be difficult when points of light lie
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within the AF point. In this case, set the lens's focus mode switch to <MF> and
focus manually ( = 48, = 51).
Shots will look slightly different from the image as displayed on the screen.
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If you use an external Speedlite and the subject is close, overexposure may
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result.
If you use an external Speedlite for a night scene with limited lighting, the
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shots may not align correctly. This may result in a blurry picture.
If you use an external Speedlite with a human subject close to the background
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that is also illuminated by the flash, the shots may not align correctly. This may
result in a blurry picture. Unnatural shadows and unsuitable colors may also
appear.
Flash coverage angle with an external Speedlite:
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• When using a Speedlite with automatic flash coverage setting, the zoom
position will be fixed to the wide (wide-angle) end regardless of the lens's
zoom position.
• When using a Speedlite requiring manual flash coverage setting, set the
flash head to the normal position.
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