Dahua IPC-HFW5100C - Button

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Figure 3-4 Adjusting bracket
3.5 Button
You can switch button to up/down to zoom in/out. You also can switch button to left/right to focus.
Long press button for 2s for auto focus which makes video clear. See Figure 2-5 and 2-6.
Note:
The button is for motorized series only.