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D. Apply power to the KC5300 camera.
E. Adjust the dc-iris lens for an optimum picture. Use the IRIS
LEVEL control on the back of the camera for optimum
picture quality.
2.6
DC IRIS BACK FOCUS ADJUSTMENT
For best results, perform back focus 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, 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.
A. After mounting the lens onto the camera, apply power to the
camera.
B. If a picture is visible, focus on the picture. If the picture is not
visible, open the iris on the lens. Open the lens as wide as
possible by placing the welder’s glass in front of the lens and
forcing the lens to automatically open.
C. When the iris is open to the widest point, re-adjust the focus
for a clear picture. If a clear picture is not possible, set the
focus ring to midrange.
D. Loosen the back focus lock screw.
E. Adjust the back focus ring for a clear picture.
F. Tighten the back focus lock screw.
G. Fine tune the focus with the focus ring on the lens.
H. Remove the welder’s glass from in front of the lens.
I. Adjust the iris of the lens for the best picture quality.
2.7
ZOOM LENS BACK FOCUS ADJUSTMENT
The objective of back focusing a zoom lens is similar to that of a
fixed focal length camera, except that the back focus is also
adjusted to maintain the focus when “zooming” the lens in and
out on a scene.
