3 Custom Function SettingsN
262
C.Fn III: Autofocus/Drive
C.Fn-7 AF-assist beam firing
Enables or disables the AF-assist beam of the built-in flash or the
EOS-dedicated external Speedlites.
0: Enable
The AF-assist beam will be emitted when necessary.
1: Disable
The AF-assist beam is not 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 an infrared AF-assist
beam will be emitted. This prevents any Speedlite which uses a
series of intermittent flashes (like the built-in flash) from firing the
AF-assist beam.
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 even if the
camera’s C.Fn-7 is set to 0, 2, or 3.
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