Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 167)

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The built-in flash and external Speedlite settings can be set with the
camera’s menu. You can use the camera’s menu to set the external
Speedlite function settings only if the attached EX-series Speedlite is
compatible with this function.
The setting procedure is the same as setting a camera menu function.
Select [Flash control].
Under the [1] tab, select [Flash
control], then press <
0>.
X The flash control screen will appear.
Normally, set this to [Enable].
If [Disable] is set, neither the built-
in flash nor the external Speedlite
will fire. This is useful when you only
want to use the flash’s AF-assist
beam.
With [Built-in flash func. setting] and [External flash func. setting],
you can set the functions listed on the next page. The functions
displayed under [External flash func. setting] will vary depending on
the Speedlite model.
Select [Built-in flash func. setting]
or [External flash func. setting].
X The flash functions will be displayed.
The functions not dimmed can be
selected and set.
3 Setting the FlashN
[Flash firing]
[Built-in flash func. setting] and [External flash func. setting]
Even if [Flash firing] has been set to [Disable], if focus is difficult to achieve
in low light, the built-in flash may still fire a series of flashes (AF-assist
beam, p.84).
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