Panasonic DMC-GH3KBODY Owner's Manual page 152

Recording
•
If you set [AF/AE Lock Hold] in the [Custom] menu to [ON], you can fix the focus and the
exposure even if you release [AF/AE LOCK] after pressing it.
[AF-ON])
•
When AE lock is performed, the brightness of the recording screen that appears on the screen
is fixed.
•
AF Lock only is effective when taking pictures in Manual Exposure Mode.
•
AE Lock only is effective when taking pictures with Manual Focus.
•
Only the AF lock is active during motion picture recording. Once you cancel the AF lock during
the recording, the AF lock cannot be reactivated.
•
The exposure is set, even if the brightness of the subject changes.
•
The subject can be focused again by pressing the shutter button halfway even when AE is
locked.
•
Program Shift can be set even when AE is locked.
(P53) (Not available with
152