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8 Pelco Manual C1961M-B (3/01)
5. Adjust the back focus.
a. Use an Allen wrench to loosen the back focus lock screw at the side of the
camera.
b. Turn the lens mount to obtain the sharpest image on the monitor.
c. Turn the back focus locking ring clockwise to tighten.
NOTE:
Do not over tighen the back focus lock screw. Over tightening the back focus
lock screw can damage the threads on the mount of the lens.
MOTORIZED ZOOM LENSES
1. With the camera operating, position the camera to view an object at least 70 feet
(25 m) away.
2. Set the lens in the following manner:
a. Set the lens iris to its widest usable opening.
b. Set the lens focus to the FAR position.
c. Adjust lens zoom to WIDE angle.
3. Adjust back focus until the object is in sharpest focus.
a. Use an Allen wrench to loosen the back focus lock screw at the side of the
camera.
b. Turn the lens mount to obtain the sharpest image on the monitor.
c. Turn the back focus locking ring clockwise to tighten.
4. Move lens zoom to TELEPHOTO.
5. Zoom out all the way while observing the focus on the monitor (known as
“tracking”). If the image stays in focus throughout the entire zoom range, the back
focus is correct. Otherwise, repeat the process beginning with step 1.