Canon EOS RP Advanced User Guide - Page 187
AF-Assist Beam, The AF-assist beam may fire repeatedly when you press the shutter button
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Selecting the AF Operation AF-Assist Beam The AF-assist beam may fire repeatedly when you press the shutter button halfway under low light or in similar conditions, to make autofocusing easier. ooThe AF-assist beam does not fire when [z: AF operation] is set to [Servo AF]. ooThe AF-assist beam does not fire when Touch AF is used (when [z: Touch Shutter] is set to [Disable]). ooWhen you are using an external flash unit, either the camera or the flash unit fires an AF-assist beam as needed. However, only the camera's AF-assist beam fires when you are using a Speedlite 90EX, Macro Ring Lite, or Macro Twin Lite. ooA small series of flashes is fired even if you set the external flash's AF-assist beam emission method in the Personal Functions to infrared AF-assist beam firing. To disable AF-assist beam firing, set [z: AF-assist beam firing] to [Disable] (=201). ooFocus range with the AF-assist beam is generally no more than 3.5 m/11.5 ft. 187