Divio NBF232P Benutzerhandbuch - Seite 19

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1. System Requirements

Appendix D: Back Focus Adjustment (Non-ABF)

This section is for Non-ABF models only. Follow the instructions below to adjust the back

focus of the camera.

When to adjust back focus

Back Focus refers to the distance from the rear lens element to the camera focal plane. In

most cases, it is required to adjust back focus only when the camera's lens cannot hold

focus throughout its zoom range.

Tools Required

Tools required when carrying out back focus adjustment include:

1. Back focus adjuster (in the IP Camera's package)

2. Test chart / contrasting object

How to adjust back focus

Step 1: Set the camera on a stable mount, with the test chart or the contrasting object at

least 75 feet (23 meters) away (or as far as possible).

Step 2: Make sure the iris is wide open. Therefore, it is suggested to keep the environment

in low light condition.

Step 3: Adjust the focus to infinite far (∞).

Step 4: Turn the zoom ring to the extreme telephoto position, and then focus on the test

chart or the contrasting object.

Step 5: Set the zoom ring to wide-angle position.

Step 6: Loosen the back focus ring's retaining screw with the supplied adjuster, and

adjust the back focus ring for sharp picture.

Step 7: Repeat Step 3 to Step 5 and adjust the back focus ring until focus can be held

throughout the zoom range.

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