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The GoPro cameras have a fixed wide-angle lens. You can change FoV / focal length of the sensor readout, to some degree. See this field of view table for the Hero3+ Black.
Because GoPro lens parameters, the hyperfocal distance is quite near. The EXIF tags of captured images say~ 0.5m. Since almost everything is in focus, the camera doesn't have to resort to autofocus.
Correspondingly, you don't have to take care of auto-focus issues with these cameras.
