Ultrak KC2200CN, Руководство по установке

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3.6 BACKFOCUS
ADJUSTMENT,
continued
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 midrange.
5. Loosen the backfocus lock screw.
6. Adjust the backfocus ring for a clear picture.
7. Tighten the backfocus lock screw.
8. Fine-tune the focus with the focus ring on the lens.
9. Remove the welder’s glass from the front of the lens.
10. Adjust the level control of the lens for the best picture
quality.
3.7 ZOOM LENS
BACKFOCUS
ADJUSTMENT
The objective of backfocusing a zoom lens is similar to
that of a fixed focal length camera, except that the
backfocus is also adjusted to maintain the focus when
zooming the lens in and out of a scene. For zoom lens
backfocus adjustment, perform the following:
1.
Choose an object at the farthest range that you wish
to look at with a zoom lens.
2.
Make sure that the iris of the lens is wide open. For
best results, make the adjustment by using a
welder’s glass placed in front of the lens.
3.
Adjust the focus to stop on the far range.
4.
Adjust the zoom on the lens to obtain the widest
picture.
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