Canon Speedlite 430EX II - Manual (Page 24)

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EOS DIGITAL cameras have one of three image sensor sizes. The lens’
effective focal length will differ depending on the camera’s sensor size.
The Speedlite automatically recognizes the EOS DIGITAL camera’s
sensor size and automatically sets the flash coverage for lens focal
lengths from 24mm to 105mm.
When the Speedlite is attached to a compatible camera, <s> will
appear on the Speedlite’s LCD panel.
When the flash fires, the color temperature information is transmitted to
the EOS DIGITAL camera. This feature optimizes the flash picture’s
white balance. When the camera’s white balance is set to <A> or
<Q>, it will work automatically.
To see if this feature works with your camera, see the Specifications in
your camera’s instruction manual.
Under low-light or low-contrast conditions when autofocus cannot be
achieved, the built-in AF-assist beam will be emitted automatically to
make it easier to autofocus. The 430EX II’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.
Auto Zoom for Image Sensor Size
About Color Temperature Information Transmission
About the AF-Assist Beam
Position Effective Range (m / ft)
Center Approx. 0.7 - 10 / 2.3 - 32.8
Periphery Approx. 0.7 - 5 / 2.3 - 16.4
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