Canon Speedlite 430EX II Manual

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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
A81_02.fm  Page 23  Thursday, February 14, 2008  12:54 PM