Canon EOS 90D Instruction Manual page 381

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Flash Firing
E-TTL II Flash Metering M
Even with setting [Eval (FacePrty)], the expected result may not be obtained
o
depending on the shooting conditions and subject.
Red-eye Reduction
Set to [ a ] (in Basic Zone or < d > modes)
to have the fl ash fi re automatically, based
on shooting conditions.
Set to [ D ] to have the fl ash always fi re
when you shoot.
Select [ b ] (in Creative Zone modes) to
keep the fl ash off , or if you will use the AF-
assist beam.
Set to [Eval (FacePrty)] for fl ash metering
suitable for shots of people.
Continuous shooting speed for [ o ] will
become slower than when [Evaluative] or
[Average] is selected.
Set to [Evaluative] for fl ash metering that
emphasizes fi ring in continuous shooting.
If [Average] is set, the fl ash exposure will
be averaged for the entire metered scene.
Set to [Enable] to reduce red-eye by
emitting the red-eye reduction lamp before
fi ring the fl ash.
Flash Function Settings
169

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