In CCTV there are lenses and concept with the light processing that are unique. From the vari-focal lenses to ND spot filters and P-iris. In addition, in CCTV we have many different size imaging sensors which produce different angles of view with the same lens. In this lecture I cover not only these concepts, but also explain Auto Iris and Manual Iris lenses, Zoom lenses, and I also show some examples on how the viewing angles can easily be calculated.