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552
Troubleshooting Guide
Depending on the attached lens, the number of usable AF points
and patterns and Area AF frame shape vary. The lenses are
categorized into 8 groups from A to H (p.145). Check which group
your lens belongs to. Using a lens in Groups E to H will have
fewer usable AF points (p.147-148).
Regarding the AF points lighting up or blinking when you press
the <S> or <B> button, see page 138.
The AF points light up in red when you shoot under low light or
when focus is achieved on a dark subject.
In the <d>, <s>, <f>, <a>, or <F> mode, you can set
whether to have the AF points light up in red for when focus is
achieved (p.488).
Set the AF operation to One-Shot AF. Focus lock is not possible in
the AI Servo AF/Servo AF mode or when servo takes effect in AI
Focus AF mode (p.97, 131).
There are fewer AF points or the Area AF frame
shape is different.
The AF point is blinking or two AF points are displayed.
The AF points do not light up in red.
I cannot lock the focus and recompose the shot.
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