Canon Speedlite 580EX II Instruction Manual page 50

About
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a@matfcally to make it easier to autofocus. The AF-
warIfg'w1th
all
EOS
cameras. The AF-assist beam is
@I
&mm and longer lenses. The effectwe range is shown
&%;era' s white balance is set to
<'m>
or
Wth
your camera, see "White Balance"
= %
pmf
camera's instruction manual.