Canon Speedlite 90EX - Manual (Page 23)

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Flash exposure compensation and other settings set with the master unit will also be
automatically set in the slave units. Thus, you need not operate the slave unit(s). Wireless
flash with the following settings can be done in the same way as with normal flash shooting.
· Flash exposure compensation · FE lock
· High-speed sync (FP flash) · Manual flash
Using Fully Automatic Wireless Flash
With FE lock, if even one Speedlite results in underexposure, the <Q> icon will blink. Increase
the ISO speed, open the aperture, or move the slave unit closer to the subject.
COP
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