Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 340
C.Fn-4, AF-assist beam firing, AF area selection method, C.Fn III: Autofocus/Drive
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3 Custom Function SettingsK C.Fn III: Autofocus/Drive C.Fn-4 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 for AF-assist. If the 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. C.Fn-5 AF area selection method You can set the method for changing the AF area selection mode. 0: S 9 AF area selection button After you press the or button, each time you press the button, the AF area selection mode changes. 1: S 9 Main Dial After you press the or button, turning the dial changes the AF area selection mode. With setting 1, press the or keys to move the AF point. When Battery Grip BG-E18 (sold separately) is used and 1 is set, you can change the AF area selection mode by operating the battery grip. 340