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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 AF-
assist beam when necessary. The camera’s built-in flash will not emit
the AF-assist beam.
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.
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.
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