Certain model cameras with Simple Focus require and additional step to take before a standard simple focus can be performed.
This includes most standard box cameras, as well as SNV-8081R & SNO-8081R.
Before performing a simple focus, press the Focus Initialization button. If a standard lens is being installed, the focus initialization should be performed before the lens is installed to put it to the default location. Next, adjust the zoom and rough focus with the controls on the lens on network controls/camera joystick.
The Focus Initialization can also be performed in bulk using the Wisenet Device Manager.
Once the Focus Initialization is complete, you can then press the Simple Focus button.