Panasonic DMC-GM1 owner manual 146, Release

6. Focus and Brightness (Exposure) Settings

Recording/not recording even when focus is not achieved [MENU] > [Custom] > [Focus/Release Priority]

[FOCUS]:

You cannot take a picture until the subject is brought into focus.

[RELEASE]:

This gives priority to the best time to take a picture so you can take a picture when the shutter button is pressed fully.

•When set to [RELEASE], please be aware that focus may not be achieved even with focus mode set to [AFS], [AFF] or [AFC].

Adjusting/not adjusting the focus manually after achieving Auto Focus [MENU] > [Custom] > [AF+MF] > [ON]/[OFF]

When AF Lock is ON (press the shutter button halfway with the focus mode set to [AFS] or set AF Lock using [AF/AE LOCK]), you can make fine adjustments to the focus manually.

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