Canon EOS Rebel SL1 18-55mm IS STM Kit Instruction Manual - Page 302
C.Fn-4, AF-assist beam firing, Mirror lockup, C.Fn III: Autofocus/Drive
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3 Custom Function SettingsN 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 EOSdedicated external Speedlite's AF-assist beam. 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 AFassist beam. 3: IR AF assist beam only When an external Speedlite is attached, only with infrared AFassist beam will be emitted. This prevents the AF-assist beam from firing 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 Mirror lockup 0: Disable 1: Enable Prevents mechanical vibrations in the camera caused by the reflex mirror action (mirror shock), which can disturb shooting with super telephoto lenses or close-up (macro) shooting. See page 147 for the mirror lockup procedure. 302