Canon EOS Rebel T5i 18-55mm IS STM Lens Kit Instruction Manual - Page 300
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 The settings to specify whether or not the AF-assist beam is emitted by the camera's built-in flash or by an external, EOS-dedicated Speedlite can be set. 0: Enable If necessary, the AF-assist beam will be emitted by the built-in flash or external Speedlite. 1: Disable The AF-assist beam is not emitted. 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 Among external Speedlites, only those which have an infrared AF-assist beam will be able to emit the beam. 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 the 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-4 is set to 0, 2, or 3. 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 142 for the mirror lockup procedure. 300