Canon EOS RP Instruction Manual page 451

For movie recording, the ISO speed cannot be expanded to L (equivalent to
o
ISO 50).
When switching from still photo shooting to movie recording, check the camera
o
settings again before recording movies.
During movie recording, avoid changing the shutter speed or aperture. Doing
o
so may record the changes in the exposure or create more noise at high ISO
speeds.
When recording a movie of a moving subject, a shutter speed of approx. 1/25
o
sec. to 1/125 sec. is recommended. The faster the shutter speed, the less
smooth the subject's movement will look.
If you change the shutter speed while recording under fluorescent or LED
o
lighting, image flicker may be recorded.
With ISO Auto, exposure compensation can be set in a range of ±3 stops.
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When ISO Auto is set, you can press the < A > button to lock the ISO speed.
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After locking the ISO speed during movie recording, you can cancel it by
pressing the < S > button. (ISO speed lock is maintained until you press the
< S > button.)
If you press the < A > button and recompose the shot, you can see the
o
exposure level difference on the exposure level indicator compared to when
the < A > button was pressed.
With the camera ready to shoot in the [ M ] mode, you can display the
o
histogram by pressing the < B > button.
ISO Speed in [ M ] Mode
You can set the ISO speed manually or select [AUTO] to set it automatically.
For details on the ISO speed, see = 589.
Recording Movies
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