Canon EOS RP Instruction Manual page 386

Interval Timer Shooting
Do not point the camera toward an intense light source, such as the sun or an
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intense artificial light source. Doing so may damage the image sensor or the
camera's internal components.
Setting the lens focus mode switch to <AF> prevents the camera from
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shooting unless subjects are in focus. Setting it to <MF> and focusing
manually before shooting is recommended.
When shooting over an extended period, consider using an optional household
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power outlet accessory.
Shooting long exposures or using shutter speeds longer than the shooting
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interval will prevent shooting at the specified interval. For this reason, fewer
shots than specified will be taken. Using shutter speeds nearly the same as
the shooting interval may also reduce the number of shots.
If the time it takes to record to the card exceeds the shooting interval due to
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the shooting functions set or card performance, some of the shots may not be
taken with the set intervals.
When using flash with interval timer shooting, set an interval longer than the
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flash charge time. Intervals that are too short may prevent the flash from firing.
Intervals that are too short may prevent shooting or autofocusing.
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Interval timer shooting will be canceled and reset to [Disable] if you set the
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power switch to < 2 >, set the shooting mode to < w / x / y >, or use EOS
Utility (EOS software).
During interval timer shooting, you cannot use remote control shooting
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( = 217) or remote-release shooting with a Speedlite.
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