Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 172)

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Flash Function Settings
 Flash exposure compensation
Just as exposure compensation is
adjustable, you can also adjust fl ash output
of the built-in fl ash ( = 166).
 Wireless functions
You can use another Canon Speedlite
compatible with optical wireless fl ash
photography to shoot with wireless multiple-
fl ash lighting ( = 180).