Canon Speedlite 320EX - Manual (Page 17)

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The result will be the same as using (Program AE).
1/X sec. is the camera’s maximum flash sync speed.
This function optimizes the white balance during flash shooting by
transmitting the color temperature information to the EOS digital
camera when the flash fires. When you set the camera white balance to
or , the function is enabled automatically.
See the Specifications in the camera’s instruction manual for
compatible models.
Z : Depth-of-field AE, Y: Auto Depth-of-field AE
Flash Sync Speeds and Apertures Used
Shutter Speed Aperture Value
Full Auto,
<d>
Set automatically (1/X sec. - 1/60 sec.) Automatic
s Set manually (1/X sec. - 30 sec.) Automatic
f Set automatically (1/X sec. - 30 sec.) Manual
a Set manually (1/X sec. - 30 sec., Bulb) Manual
Function for Transmitting the Color Temperature
Information
COP
Y