Canon Speedlite 90EX - Manual (Page 11)

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In this mode, the camera will automatically adjust the flash output level to achieve standard
exposure with Program AE, which automatically sets the shutter speed and aperture
according to the brightness of the subject.
• If the resulting picture is underexposed, increase the ISO speed.
In this mode, the camera will automatically adjust the flash output level to achieve standard
exposure for the automatically set aperture.
• If the aperture display blinks, it means that the background exposure will be underexposed
or overexposed. Adjust the shutter speed until the aperture display stops blinking.
Flash Shooting in Each Camera Mode
V : Program AE
X : Shutter Priority AE
COP
Y