Backfocus Adjustment - Syscom Video DSP COLOR CAMERA Instruction Manual

BACKFOCUS ADJUSTMENT

Although the camera lens was backfocused 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. After mounting the lens on the camera, apply power.
2. If a picture is visible, focus on the scene. If a picture is not visible, open
the iris on the lens. Open the lens as wide as possible by placing a
welder's glass in front of the lens.
3. 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 midrange.
4. Loosen the backfocus lock screw.
5. Adjust the backfocus ring for a clear picture.
6. Tighten the backfocus lock screw.
7. Fine-tune the focus with the focus ring on the lens.
8. Remove the welder's glass from the front of the lens.
9. Adjust the iris of the lens for the best picture quality.
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