Canon ICAM62B Advanced User's Manual page 292

Flash Function Settings
Flash Firing
E-TTL II Flash MeteringM
Red-eye Reduction
292
Set to [a] to have the flash fire
automatically, based on shooting
conditions.
Set to [D] to have the flash always fire
when you shoot.
Set to [b] to disable flash firing.
For normal flash exposures, set it to
[Evaluative]. If [Average] is set, the flash
exposure will be averaged for the entire
metered scene.
Set to [Enable] to reduce red-eye by
emitting the red-eye reduction lamp before
firing the flash.