Sony Alpha 9 - Manual (Page 68)

ILCE-9
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AF System
Sets the focus detection system (Phase Detection AF/Contrast AF) when
you attach an A-mount lens using an LA-EA1/LA-EA3 Mount Adaptor
(sold separately).
MENU  (Camera Settings 1)  [ AF System]  desired
setting.
Phase Detection AF: Focuses with Phase Detection AF. The focusing
speed is very fast.
Contrast AF: Always focuses with Contrast AF. The focusing speed is
slower. Use when you cannot focus with [Phase Detection AF].
Note
• When [ AF System] is set to [Contrast AF], [Continuous AF] under
[Focus Mode] is unavailable.
• The following functions are unavailable when [ AF System] is set to
[Phase Detection AF]:
– [Zone], [Expand Flexible Spot], and [Lock-on AF] in [Focus Area]
– [Eye AF]
• When [ AF System] is set to [Phase Detection AF], [Priority Set in AF-S] will
temporarily switch to [AF] even if it is set to [Balanced Emphasis].