Panasonic Lumix DMC-GM5 Owner's Manual For Advanced Features page 140

5. Focus and Brightness (Exposure) Settings
About [AFS] of the focus mode dial
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In [AFS/AFF] in the [Rec] menu or the [Motion Picture] menu, you can assign [AFS] or
[AFF] to [AFS] of the focus mode dial.
When recording using [AFF], [AFC]
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It may take time to focus on the subject when you operate the zoom from Wide to Tele or
suddenly change the subject from a distant one to a nearby one.
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Press the shutter button halfway again when it is difficult to focus on the subject.
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While the shutter button is pressed halfway, shake may be seen on the screen.
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When the brightness is insufficient for [AFF] or [AFC], the camera will operate as if [AFS] has
been set. In this case, the display will change to the yellow [AFS].
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If you set the focus mode to [AFF] or [AFC] in Panorama Shot Mode, [AFS] will operate.
Not available in these cases:
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Depending on the lens used, [AFF] and [AFC] may not operate.
Refer to the website for compatible lenses.
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