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7.3
Back Focus Adjustment (Non-ABF Models Only)
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, and place the test chart or the
contrasting object at a far location (at least 10 meters).
Step 2:
Adjust the focus to infinite far (
∞
) position.
Step 3:
Turn the zoom adjustment bar to the extreme telephoto position, and
then focus on the test chart or the contrasting object.
Step 4:
Turn the zoom adjustment bar to wide-angle position, and then focus on
the test chart or the contrasting object.
Step 5:
Loosen the back focus ring’s retaining screw with the supplied adjuster,
and adjust the back focus ring for sharp image.
Step 6:
Repeat
Step 3 to Step 5
and adjust the back focus ring until focus can
be held throughout the zoom range.
Step 7:
Tighten the retaining screw to fasten the back focus ring.
