AF-assist beam firing
Enables or disables the EOS-dedicated Speedlite’s AF-assist beam
 | ON: Enable The external Speedlite emits the AFassist beam when necessary. OFF: Disable The external Speedlite will not emit the AF-assist beam. This prevents the AFassist beam from disturbing others. IR: IR AF assist beam only Among external Speedlites, only models with an infrared AF-assist beam will be able to emit the beam. Set this if you do not want the AF assist to be emitted as small flashes. |
If the external Speedlite’s Custom Function [AF-assist beam firing] is set to [Disable], this function’s setting will be overridden and the AF-assist beam will not be emitted
