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CMS-XML 430EX Speedlite : How to use the AF-Assist Beam and what is its coverage
Under low-light or low-contrast conditions , the built-in AF-assist beam will be emitted automatically to make it easier to autofocus. The 430 EX's AF- assist beam is compatible with the AF points of almost all EOS cameras. The AF-assist beam is compatible with 28mm and longer lenses.
CMS-XML List of custom functions available on the 430EX Speedlite.
C.Fn-04 AF- assist beam OFF 0
CMS-XML Specifications of the 430EX Speedlite.
For high sync speed (EF flash): Approx. 2.3-39.4 ft./0.7-12m AF Assist Beam