Panasonic Lumix DMC-LX100 Owner's Manual page 134

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AF Lock only is effective in the following case:
• [Manual Exposure] Mode
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During Manual Focus, only AE Lock can be used.
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Only the AF Lock is enabled when you are recording motion pictures. Once you cancel AF Lock
while recording motion pictures, you cannot perform the AF Lock operation again.
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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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Lock is canceled when a zoom operation is performed after locking the exposure and/or focus.
Perform the locking operation again.
134
Taking pictures by locking the focus and/or exposure [AF/AE Lock]
Adjusting the focus and brightness (exposure)
SQW0021