11
KCMU000002
05/30/01
BACKFOCUS ADJUSTMENT
Although the camera backfocus was adjusted by the
manufacturer prior to shipping, it may be necessary to
make modifications.
For best results, perform backfocus adjustments at
night or while using a #6 or #8 welder’s glass in front
of the lens. The focus of the camera will change
slightly if the camera iris was adjusted on a light scene
and then changes to a dark scene. However, the
camera will remain in focus if the iris was focused on
a dark scene and the scene lightens.
To make backfocus adjustments, perform the
following:
1. Mount the lens on the camera and apply power.
2. Open the camera iris by turning the lens level
control counterclockwise.
3. If a picture is visible, focus on the scene.
Open the lens as wide as possible by placing a
welder’s glass in front of the lens.
4. When the iris is open to the widest point, readjust
the focus for a clear picture. If a clear picture is
not visible, set the focus ring to mid-range.
5. Loosen the backfocus lock screw.
6. Adjust the backfocus ring for a clear picture.
7. Tighten the backfocus screw lock.
8. Fine-tune the focus with the focus ring on the lens.
9. Remove the welder’s glass from in front of the
lens.
10. Adjust the level control of the lens for the best
picture quality.
