Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 218)

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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 an EX-series Speedlite compatible
with this function is attached.
The setting procedure is the same as when setting a camera menu
function.
Select [Flash control].
Under the [z1] 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.
For normal flash exposures, set this
to [Evaluative].
[Average] is for advanced users. As
with an external Speedlite, the
metering area is averaged. Flash
exposure compensation may be
necessary.
3 Setting the FlashN
[Flash firing]
[E-TTL II meter.]
Even if [Flash firing] is set to [Disable], if focus is difficult to achieve in low
light, the flash may still fire a series of flashes (AF-assist beam, p.101).
COP
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