External Speedlites - Canon EOS REBEL XS EOS REBEL XS Instruction Manual

External Speedlites

EOS-dedicated, EX-series Speedlites
Basically operates like a built-in flash for easy operation.
When an EX-series Speedlite 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, see 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
Only [Flash exp. comp] and [E-TTL II] can be settable for flash function
settings (p.117) with an EX-series Speedlite not controllable by the camera.
(For some EX-series Speedlites, [Shutter sync.] can also be settable.)
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Macro Lites