Panasonic Lumix G100 Mirrorless Camera with 12-32mm Lens - Manual (Page 96)

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4. Recording mode
Shutter-Priority AE Mode
In [ ] mode (Shutter-Priority AE mode), you can set the shutter speed
before recording.
The aperture value will be automatically set by the camera.
Slower shutter speeds
It becomes easier to capture motion
Faster shutter speeds
It becomes easier to freeze motion
1
Set the mode dial to [ ].