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f: Selecting the AF OperationN
While you press the shutter button
halfway and the camera focuses with AF,
the <e> icon will appear under the
focus indicator in the viewfinder.
In One-Shot AF mode, the icon also appears if you press the shutter
button halfway after focus is achieved.
By default, the AF points light up in red in low-light conditions. In the
<d>, <s>, <f>, <a>, or <F> mode, you can set whether to have
the AF points light up in red (p.132).
AF Operation Indicator
AF Points Lighting Up in Red