Priority Set In Af-S; Priority Set In Af-C - Sony ILCE-9 Instruction Manual

Priority Set in AF-S

Sets whether to release the shutter even if the subject is not in focus
when [Focus Mode] is set to [Single-shot AF] or [DMF] and the subject is
remaining still.
MENU  (Camera Settings 1)  [Priority Set in AF-S] 
desired setting.
AF: Prioritizes focusing. The shutter will not be released until the subject
is in focus.
Release: Prioritizes the shutter's release. The shutter will be released even
if the subject is out of focus.
Balanced Emphasis: Shoots with a balanced emphasis on both focusing
and shutter release.

Priority Set in AF-C

Sets whether to release the shutter even if the subject is not in focus
when the continuous AF is activated and the subject is in motion.
MENU  (Camera Settings 1)  [Priority Set in AF-C] 
desired setting.
AF: Prioritizes focusing. The shutter will not be released until the subject
is in focus.
Release: Prioritizes the shutter's release. The shutter will be released even
if the subject is out of focus.
Balanced Emphasis: Shoots with a balanced emphasis on both focusing
and shutter release.
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