Canon EOS 5D Mark IV L-series Zoom Lens Kit Manuale Proprietario

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 Customizing AF FunctionsN
Enables or disables the EOS-dedicated external Speedlite’s AF-assist 
beam.
ON: Enable
The external Speedlite emits the AF-
assist beam when necessary.
OFF: Disable
The external Speedlite will not emit the 
AF-assist beam. Useful when the AF-
assist beam may disturb others.
IR: IR AF assist beam only
When an external Speedlite is attached, only the infrared AF-assist 
beam will be emitted. Useful when you do not want to fire a series of 
small flashes as the AF-assist light (Intermittent flash method).
With an EX-series Speedlite equipped with an LED light, the LED 
light will not automatically turn on as the AF-assist light.
AF-assist beam firing
AF3
If an external Speedlite’s [AF-assist beam firing] Custom Function is set to 
[Disable], this function’s setting will be overridden and the AF-assist beam 
will not be emitted.