Canon T5I 用户指南

3

 Custom Function SettingsN

300

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.

The AF-assist beam is not emitted.

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.

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.

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.

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.

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