Panasonic Lumix S5 Mirrorless Camera - Manual (Page 190)

7. Metering/Exposure/ISO Sensitivity
190
In [S] mode (Shutter-Priority AE mode), you can set the shutter speed
before recording.
The aperture value will be automatically set by the camera.
1
Set the mode dial to [S].
Shutter-Priority AE Mode
Slower shutter speeds
It becomes easier to capture motion
Faster shutter speeds
It becomes easier to freeze motion