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On: enable, Off: disable – Canon EOS-1D X Mark II DSLR Camera (Body Only) User Manual

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Customizing AF Functions

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

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.