Canon REBEL SL1 EOS 100D Instruction Manual page 16

External Speedlites
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Basically operates like a built-in flash for easy operation,
When an EX-series Speedlite (sold separately) is attached to the
camera, almost all the autoflash control is done by the camera. In other
words, it is like a high-output flash attached externally in place of the
built-in flash.
For detailed instructions, refer to the EX-series Speedlite's
instruction manual, This camera is a Type-A camera that can use all
the features of EX-series Speedlites.
Shoe-mount Speedlites Macro Lites
[_] With an EX-series Speedlite not compatible with flash function settings
(p.233), only [Flash exposure compensation] can be set for [External
flash func. setting]. (]Shutter synchronization] can also be set with
certain EX-series Speedlites.)
If flash exposure compensation is set with the external Speedlite, the
flash exposure compensation icon displayed on the camera's LCD
monitor wilt change from _ to _=_.
If the external Speedlite's Custom Function has the flash metering mode
set to TTL autoflash, the flash will fire at full output only.
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