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Canon EOS 40D Guide to Digital Photography by David D. Busch

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C.Fn III-04: Whether the Autofocus Points Are Highlighted in the Viewfinder

Superimposed display

The C.Fn-10 Superimposed display function controls whether the AF points are illuminated in the viewfinder when autofocus is locked. Some people find the glowing red brackets distracting.

  • 0: On. One or more focus points glow in red when focus locks.

  • 1: Off. The focus points are not illuminated unless one is selected manually. Some find this option useful when the constant blinking of the AF point in the viewfinder becomes distracting.

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