The Marshall V-ZPL-12 is a CS-mount pinhole lens with manual zoom function for changing conditions or location. With a 1/3" CCD camera the lens at full wide will display a 60° horizontal angle of view. At the other end of the spectrum, 20 mm will show a narrow 13° horizontal angle. Aperture changes with focal length. At the maximum zoom 20 mm the lens has a f/12.5 aperture (f-stop=focal length/1.6). The lens is made for tough industrial environments. A push-on front cap has two functions. It has a clear tip to protect the lens' front element. The cap also has a mounting support.