C. Fn Iii: Auto Focus/Drive; C.fn-7 Af-Assist Beam Firing; C.fn-9 Af During Live View Shooting; C.fn-9 Mirror Lockup - Canon EOS 450D Instruction Manual

Custom Function Settings*
C,Fn Ill: Auto foeustDdve
The AF-assist beam can be emitted by the camera's builtdn 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 buHtdn flash will not emit
the AF-assist beam.
if the external, EOS_dedicated sPeedlite:s [AF,assJst beam firing] Custom
Function !s settQ [Disabled], the Speedlite wi!! not emit the AE-assist beam
even if the camera's C.Fn-7-0/2 is set.
When I or 2 is set, AF will be possible during Live View shooting. For
details, see pages 102 o 106.
0: Disable
1: Quick mode (p.102)
2: Live mode (p.104)
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 Iockup procedure.
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