The Tamron Tamron 13VM20100AS 1/3" 20-100mm F/1.6 Aspherical Vari-Focal CCTV lens is a 5x manual zoom lens designed for security and robotics cameras with 1/3-inch CCD. It has a variable focal range from 20 mm to 100 mm with a maximum aperture of f/1.6. This is a fully manual lens for all functions including zoom, iris and focus. Each setting ring can be locked into place. Key Features: This is a 5x zoom lens designed for industrial cameras. At full wide 20 mm the lens shows 14° horizontal angle view. At full telephoto the lens will display 2.8° view. The lens features fully manual operation for zoom, focus and aperture settings. Each setting ring can be locked into place so unwanted changes don't occur once fixed to the camera.