Canon Speedlite 58OEX Instruction Manual page 47

About Color Temperature Information Transmission
When the flash fires, the color temperature information is transmitted to
certain specific EOS digital camera. This feature optimizes the flash picture's
white balance. When the camera's color balance is set to
<mw3>
or
<~>,
it
will work automatically.
To see if this feature works with your camera, see the white balance
specification in the "Major Specifications" of your camera's instruction
manual.
Reverting to 580EX Default Settings
If your EOS camera has the
<CLEAR>
button, you can press it to revert the
camera settings (except Custom Functions) to the default.
About the AF-Assist Beam
Under low-light or low-contrast conditions, the built-in AF-assist beam will be
emitted automatically to make it eaasier to autofocus. The AF-assist beam
works with all EOS cameras. The AF-assist beam is compatible with 28mm
and longer lenses. The effective range is shown below.
Position . . . . . . .
Effective Range(m f ft)
. ..
Center 0.6 - 10 / 2 - 32.8
Periphery 0.6 - 5/2 - 16.4
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