Canon 580EX User Manual
Page 23
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Automatic Setting of Flash Coverage for the Camera’s Image Size
EOS digital cameras have one of three image sizes. The lens’ effective focal
length will differ depending on the camera's image size. The Speediite
automatically recognizes the EOS digital camera's Image size and
automatically sets the flash coverage far lens focal lengths from 24nnm to
105mm.
When the Speediite is attached to a compatible camera, <B> will appear
on the Speedlite's LCD panel.
ETTL Zoom Sum.
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