AVer System Contrll Pro User Manual (NV version) - Manual (Page 35)

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Zoom in/out
Rotate the joystick to the clockwise side to zoom in and counterclockwise to zoom out.
2.9.2 To Focus the Object
Press button to focus the object in the distance. Press button to focus the object in
nearby.
2.9.3 Adjusting the Brightness of the Image
Press and to adjust the IRIS of camera lens.