Canon EOS RP Instruction Manual page 366

Setting Noise Reduction
Cautions for Setting Multi Shot Noise Reduction
If there is significant misalignment in the image due to camera shake, the
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noise reduction effect may become smaller.
If you are handholding the camera, keep it steady to prevent camera shake.
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Using a tripod is recommended.
If you shoot a moving subject, the moving subject may leave afterimages.
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Auto image alignment may not function properly with repetitive patterns (lattice,
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stripes, etc.) or flat, single-tone images.
If the subject's brightness changes as the four consecutive shots are taken,
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irregular exposure in the image may result.
After shooting, it may take some time to record an image to the card after
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performing noise reduction and merging the images. [BUSY] is displayed
as images are processed, and shooting is not possible until processing is
finished.
[Multi Shot Noise Reduction] is not available with bulb shooting, shooting
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with AEB or WB bracketing, shooting RAW or RAW+JPEG images, or with
features such as long exposure noise reduction, multiple exposures, or HDR
mode.
Flash photography is not possible. Note that the AF-assist beam of EOS-
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dedicated, external Speedlites will be emitted according to the [ z : AF-assist
beam firing] setting.
[Multi Shot Noise Reduction] is not available (not displayed) when recording
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movies.
Automatically switches to [Standard] if you set the power switch to < 2 >,
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replace the battery or card, switch to a Basic Zone or <B> shooting mode, or
switch to movie recording.
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