User Manual - Page 141

For 1897C002.

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141
AF Area Selection Mode
When AI Servo AF mode is set for Zone AF, Large Zone AF, or Automatic
selection AF, the active AF point <r> will keep switching to track the
subject. However, under certain shooting conditions (such as when the
subject is small), it may not be able to track the subject.
With Single-point Spot AF, focusing with an EOS-dedicated, external
Speedlite’s AF-assist beam may be difficult.
If a peripheral AF point or a wide-angle or telephoto lens is used,
achieving focus may be difficult with an EOS-dedicated, external
Speedlite’s AF-assist beam. In such a case, use the center AF point or
an AF point close to the center.
When the AF point(s) light up, part or all of the viewfinder may light up in
red. This is a characteristic of AF point display.
In low temperatures, the AF point display may be difficult to see or have
a slower tracking response due to the characteristics of AF point display
device (using liquid crystal).
With [8C.Fn II-10: Orientation linked AF point], you can set the AF area
selection mode + AF point or only the AF point separately for the horizontal
and vertical orientations (p.483).
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