Panasonic Lumix DMC-GF3 Basic Owner's Manual page 195

[AF/AE LOCK]
•
Refer to P98 for details.
[FOCUS PRIORITY]
•
It is recommended that this feature be left on, to minimize the possibility of pictures with poor
focus.
•
[FOCUS PRIORITY] is disabled during motion picture recording.
Recording
[AE]/[AF]/[AF/AE]
It will set so no picture can be taken when it is out of focus.
[OFF]: This gives priority to the best time to take a picture so
you can take a picture when the shutter button is
pressed fully.
[ON]: You cannot take a picture until the subject is brought
into focus.
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