Canon Kit08-T1i-1855IS-55250IS EOS REBEL T1i/EOS 500D Instruction Manual - Page 187
NC.Fn III: Autofocus/Drive
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3 Custom Function SettingsN C.Fn III: Autofocus/Drive C.Fn-8 AF-assist beam firing The AF-assist beam can be emitted by the camera's built-in flash or by the external, EOS-dedicated Speedlite. 0: Enable 1: Disable The AF-assist beam is not emitted. 2: Only external flash emits If an external, EOS-dedicated Speedlite is attached, it will emit the AFassist beam when necessary. The camera's built-in flash will not fire the AF-assist beam. If the external, EOS-dedicated 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-8-0/2 is set. C.Fn-9 Mirror lockup 0: Disable 1: Enable Prevents camera vibrations caused by the reflex mirror action which can disturb shooting with super telephoto lenses or close-up (macro) shooting. See page 104 for the mirror lockup procedure. 187