The Fujinon TF15DA-8 is a very high quality C-mount lens designed for the toughest industrial environments. It is a fixed 15mm focal length lens with a maximum aperture of f/2.2. All functions, iris and focus, are manually controlled. In robotics and machine vision uses the lens can resolve enough detail for the highest grade of 3-CCD cameras. It can close-focus down to about 4".