Canon EOS 5DS R Instruction Manual - Page 121
ON: Enable, OFF: Disable, AF-assist beam firing, IR: IR AF assist beam only
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3 Customizing AF FunctionsN AF-assist beam firing Enables or disables the AF-assist beam from the EOS-dedicated external Speedlite. ON: Enable The external Speedlite emits the AFassist beam when necessary. OFF: Disable The external Speedlite will not emit the AF-assist beam. Prevents the AFassist beam from disturbing others. IR: IR AF assist beam only When an external Speedlite is attached, only the infrared AF-assist beam will be emitted. This prevents the AF-assist light from firing as a burst of small flashes. With an EX-series Speedlite equipped with an LED light, the LED light will not automatically turn on for AF-assist. If an external Speedlite's [AF-assist beam firing] Custom Function is set to [Disabled], the Speedlite will not emit the AF-assist beam regardless of this setting. 121