1. List commands
2. Focus / Zoom
3. Settings that worked in my garage
4. Settings that worked in my office
5. Settings that worked in my homeoffice with a C920

List commands

v4l2-ctl -d /dev/video2 --list-ctrls

Focus / Zoom

v4l2-ctl -d /dev/video2 --set-ctrl=focus_auto=0
v4l2-ctl -d /dev/video2 --set-ctrl=focus_absolute=20
v4l2-ctl -d /dev/video2 --set-ctrl=zoom_absolute=100

Settings that worked in my garage

v4l2-ctl -d /dev/video0 --set-ctrl=white_balance_temperature_auto=0
v4l2-ctl -d /dev/video0 --set-ctrl=white_balance_temperature=4700
v4l2-ctl -d /dev/video0 --set-ctrl=saturation=100
v4l2-ctl -d /dev/video0 --set-ctrl=brightness=100

Settings that worked in my office

v4l2-ctl -d /dev/video0 --set-ctrl=white_balance_temperature_auto=0
v4l2-ctl -d /dev/video0 --set-ctrl=white_balance_temperature=4700

Settings that worked in my homeoffice with a C920

v4l2-ctl -d /dev/video0 --set-ctrl=white_balance_temperature_auto=0
v4l2-ctl -d /dev/video0 --set-ctrl=white_balance_temperature=4500
v4l2-ctl -d /dev/video0 --set-ctrl=saturation=90
v4l2-ctl -d /dev/video0 --set-ctrl=brightness=120