public void setZoomSensitivity(float zoomSensitivity) {
        this.zoomSensitivity = zoomSensitivity;
    }
Sets the zoom sensitivity, the lower the value, the slower the camera will zoom in and out.
default is 2.

@param zoomSensitivity the desired factor (default=2)
jme3-core/src/main/java/com/jme3/input/ChaseCamera.java