About Color Temperature Information Transmission; Reverting To 430Ex Default Settings; About The Af-Assist Beam - Canon Speedlite 430EX Instruction Manual

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
<A> or <Q>, it will work automatically.
To see if this feature works with your camera, see the "White Balance"
specification in the "Specifications" of your camera's instruction manual.

Reverting to 430EX Default Settings

When 430EX is attached to an EOS camera equipped with a <B>
button, you can press it to revert the 430EX's 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
430EX'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. The effective range is shown below.
22
Position
Center Approx. 0.7 - 10 / 2.3 - 32.8
Periphery
Effective Range (m / ft)
Approx. 0.7 - 5 / 2.3 - 16.4