The Marshall V-4512 is a 12mm C-mount industrial lens with a fixed f/2.0 iris. It is designed to be used with automatic shutter cameras to compensate for the unchangeable aperture. This is a manual focus lens.
All Glass Optics
The V-4512 is a small and inexpensive C-mount lens that does not sacrifice performance for value. Marshall is among the few companies that manufacturers these industrial lenses and they use all glass elements to produce high quality images.