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3 Custom Function Setting ItemsN
392
C.Fn III: Autofocus/Drive
C.Fn-5 AF-assist beam firing
Enables or disables the built-in flash’s AF-assist beam or the EOS-
dedicated external Speedlite’s AF-assist beam.
0: Enable
The AF-assist beam will be emitted when necessary.
1: Disable
The AF-assist beam will not be emitted. This prevents the AF-
assist beam from disturbing others.
2: Enable external flash only
If an external Speedlite is attached, it will emit the AF-assist beam
when necessary. The camera’s built-in flash will not fire the AF-
assist beam.
3: IR AF assist beam only
When an external Speedlite is attached, only the infrared AF-assist
beam will be emitted. Set this when you do not want the camera to
fire the AF-assist beam as a burst of small flashes.
With an EX-series Speedlite equipped with an LED light, the LED
light will not automatically turn on as the AF-assist beam.
If an external Speedlite’s [AF-assist beam firing] Custom Function is set to
[1:Disable], this function’s setting will be overridden and the AF-assist beam
will not be emitted.
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