The argument "sane" tells the script to set the camera control setting to a "reasonable" default ... When queried with v4l2-ctl -L, the Logitech C920 reports that the exposure values can be set to a ...
Dive a little deeper into the included software, and you get an impressive amount of control ... and sound from your webcam is crisp and clear you'll be fine, and the Logitech C920 Pro HD ...