Panasonic Lumix DC-GH5M2

7. Metering/Exposure/ISO Sensitivity – Shutter-Priority AE Mode
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Shutter-Priority AE Mode
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.
Slower shutter speeds
It becomes easier to capture motion.
Faster shutter speeds
It becomes easier to freeze motion.