This Computar 1.1" 25mm f/2.8 12MP Ultra Low Distortion Lens is designed for cameras with a C-Mount for use in a variety of applications. It has a fixed focal length of 25mm, and resolves an image on 1.1" cameras with 12MP sensors. Featuring a minimum working distance of just under 12", the lens focuses to infinity and incorporates both lockable iris and focus rings, so you can leave the lens set up and not have to worry about either ring changing over time. The front of the lens incorporates an M34.0 filter thread.