Canon EOS REBEL XS Instruction Manual page 24

Flash Control *
® EoTTL II
For normal flash exposures, set it to [Evaluative].
If [Average] is set, the flash exposure will be averaged for the entire
metered scene as with an external metering flash. Flash exposure
compensation may be necessary depending on the scene, so tMs is
for advanced users.
Setting the E×temal Speedtites
Select either [External flash rune. setting] or [External flash C.Fn
setting]. For details on which e×ternal Speedlite settings the
camera can set, see the compatible EXosedes (such as the 580EX II)
Speedtite's instruction manualo
Attach the Speedlite to the camera and turn on the Speedlite.
Select either [E×temai flash rune.
setting] or [ExtemaJ flash C.Fn
setting].
e Select either one, then press <_>.
® Settings which cannot be set will be
dimmed.
E×temal flash C.Fn setting
Set the e×temal flash function settings.
® Select a flash function and set it as
desired. The procedure is the same
as setting a menu function.
® On the flash function settings screen,
the settable items or current settings
displayed differ depending on the
current flash mode settings or flash
Custom Function settings.
® if you press the <DISR> button to
clear the Speedlite settings, both the
external Speedlite and built-in flash
settings will be cleared.
117