Panasonic Lumix DMC-GM5 Owner's Manual For Advanced Features page 160

5. Focus and Brightness (Exposure) Settings
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AF Lock only is effective when taking pictures in Manual Exposure Mode.
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AE Lock only is effective when taking pictures with Manual Focus.
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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.
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The subject can be focused again by pressing the shutter button halfway even when AE is
locked.
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Program Shift can be set even when AE is locked.
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