Sunell's 5MP optical defog PTZ camera has brought about a new defog image process. The camera supports "electronic defogging + optical defogging" dual modes. Optical defogging can detects more IR information in fog. The principle of optical imaging is used to improve the picture clarity, enhancing the details of the surveillance target. Monitoring security may be increased by using the camera in foggy locations, such as scenic and hilly areas.