GE Interlogix KTC-115CC User Manual page 12

Making Additional Adjustments
5) Adjust the lens' focal position (with the filter in place, if used) by
gently turning the back focus adjustment ring to achieve the
sharpest image.
6) Retighten the back focus adjustment lock screw carefully while
ensuring that the focus does not change.
7) Position the camera for the required view, and if needed, adjust the
focus using only the focus ring on the lens.
8) If you are using an auto iris lens, adjust the DC level for optimum
performance.
12
KTC Compact Cameras
1040206A / December 2002