Panasonic WV-CL920 - Manual (Page 13)

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Screw
Flange-back
Adjusting Ring
The following adjustment should be made by qualified
service personnel or system installers.
1. Loosen the screw on the side of the camera.
2. Turn the flange-back adjusting ring to the desired
position.
Note: Adjusting a focus in the visible rays may be
soft-focused with the near-infrared light.
3. Tighten the screws on the side of the camera.
Caution: Tightening the screw by force will cause
damage to the screw or deviation of focus.
FOCUS OR FLANGE-BACK ADJUSTMENT