easynet EC-2M-F1N-ONV Руководство пользователя - Страница 12

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2. Installation and Configuration

2.3 Varifocal Lens Back

The objective of back focusing is to suit different types of lenses that are in the market. To

The objective of back focusing

obtain the maximum far (wide) or tele (narrow) view from particular lens, back focusing might

obtain the maximum far (wide) or tele (narrow) view from particular lens, back

be needed.

1. Choose an object at the farthest range

Choose an object at the farthest range.

2. Make sure the iris of the lens is wide

Make sure the iris of the lens is wide open. Do this by adjusting the camera

lens at night or place a

environment.

3. Adjust the focus on the lens on its maximum

4. Adjust the zoom on the lens

Adjust the zoom on the lens on its maximum "wide" range.

5. Loosen the back focus lock screw.

Loosen the back focus lock screw.

6. Adjust the back focus ring for the clearest picture.

Adjust the back focus ring for the clearest picture.

7. Tighten the back focus lock screw.

Tighten the back focus lock screw.

8. Repeat the previous steps as necessary to maintain a clear picture throughout the

Repeat the previous steps as necessary to maintain a clear picture throughout the

entire zoom range.

ack Focus Adjustment

is to suit different types of lenses that are in the market. To

place a welders glass in front of the lens to imitate the night

on the lens on its maximum "far" range.

open. Do this by adjusting the camera and its

to imitate the night