Canon EOS Rebel XS User Manual - Page 157
NC.Fn III: Auto focus/Drive
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3 Custom Function SettingsN C.Fn III: Auto focus/Drive C.Fn-6 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 AF-assist beam 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 emit 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-6-0/2 is set. C.Fn-7 AF during Live View shooting When 1 or 2 is set, AF will be possible during Live View shooting. For details, see pages 102 - 106. 0: Disable 1: Quick mode (p.102) 2: Live mode (p.104) C.Fn-8 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 94 for the mirror lockup procedure. 157