Panasonic Lumix G100 Mirrorless Camera with 12-32mm Lens - Manual (Page 93)

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4. Recording mode
Aperture-Priority AE Mode
In [ ] mode (Aperture-Priority AE mode), you can set the aperture value
before recording.
The shutter speed will be automatically set by the camera.
Smaller aperture values
It becomes easier to defocus the
background.
Larger aperture values
It becomes easier to bring everything
into focus including the background.
1
Set the mode dial to [ ].