Autofocus - Minolta Dynax 7xi Instruction Manual

Autofocus (AF)
The autofocus system uses expert programming and fuzzy logic to
determine which of the AF sensors is detecting your main subject. The
camera's ultra-wide AF area has four sensors —two vertical and two
horizontal. When you hold the camera horizontally, all four sensors are
active; when you hold the camera vertically, the top horizontal sensor shuts
off and the AF area changes to its vertical mode.
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