Sony ILCE-6000 - Manual (Page 117)

When [ AF Illuminator] is set to [Auto], and [Focus Area] is set to [Wide] or [Zone], an AF range finder frame may
be shown by the dotted line.
When you use a zoom function other than the optical zoom, the [Focus Area] setting is disabled and the focus area
frame is shown by the dotted line. The AF operates with priority on and around the center area.
Notes on use
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