3 Custom Function SettingsN262C.Fn III: Autofocus/DriveC.Fn-7 AF-assist beam firingEnables or disables the AF-assist beam of the built-in flash or theEOS-dedicated external Speedlites.0: EnableThe AF-assist beam will be emitted when necessary.1: DisableThe AF-assist beam is not emitted. This prevents the AF-assistbeam from disturbing others.2: Enable external flash onlyIf an external Speedlite is attached, it will emit the AF-assist beamwhen necessary. The camera’s built-in flash will not fire the AF-assist beam.3: IR AF assist beam onlyWhen an external Speedlite is attached, only an infrared AF-assistbeam will be emitted. This prevents any Speedlite which uses aseries of intermittent flashes (like the built-in flash) from firing theAF-assist beam.With an EX-series Speedlite equipped with an LED light, the LEDlight will not automatically turn on for AF-assist.If an external Speedlite’s [AF-assist beam firing] Custom Function is setto [Disabled], the Speedlite will not emit the AF-assist beam even if thecamera’s C.Fn-7 is set to 0, 2, or 3.COPY
