Canon EOS Rebel xsi - Manual (Page 166)

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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.
External Speedlites
EOS-dedicated, EX-series Speedlites
Shoe-mount Speedlites Macro Lites
Only [E-TTL II] and [Flash exp. comp] can be settable for flash function
settings with an EX-series Speedlite not controllable by the camera.
(For some EX-series Speedlites, [Shutter sync.] can also be settable.)
H73_10.fm Page 166 Monday, November 12, 2007 3:44 PM