Vista VK-C402DN, Install And User Manual

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6. Adjust the auto iris lens for an optimum picture using the LEVEL control on the "DC ↓ " of the
OSD AE MENU.
2.4.6 MANUAL IRIS LENS ADJUSTMENT
When using a manual iris lens, turn the iris ring on the lens to the OPEN position and adjust the
manual iris for the appropriate range. Adjust during the brightest conditions, opening the lens to the
minimum f-stop yielding a good picture under the brightest scene conditions. Do not saturate the
picture.
Manual iris lenses are generally used internally only
2.5 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.
1. The lens should be mounted on the camera before applying power.
2. 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.
3. When the iris is open to the widest point, re-adjust the focus for clear picture. If a clear
picture is not possible, set the focus ring to midrange.
4. Loosen the back focus lock screw.
5. Adjust the back focus ring for a clear picture.
6. Tighten the back focus lock screw.
7. Fine tune the focus with the focus ring on the lens.
8. Remove the welder's glass from in front of the lens.
9. Adjust the iris of the lens for the best picture quality.