What are the various types of CCTV lenses?

Most of the network cctv cameras on this site come with one of the following lenses:

Fixed Focus Board Lens – these are miniature lenses with a fixed focal length. In some cases the lenses may be exchangeable for Board Lenses of different focal lengths. See the individual camera data sheets for more details.

Fixed-Focus CS-Mount Lens. The CS Mount lens is a common standard lens. This is of a fixed focal length, but can be exchanged for any other fixed focal length CS-Mount lens. These lenses can also be replaced by vari-focal lenses, where the lens focal length is set up on installation to get the best possible field of view. Beware, CS-Mount lens capability does not imply the ability to use auto-iris lenses, this is a separate feature.

Vari-Focal Fixed-Iris Lens – these are generally CS-Mount lenses which can be adjusted manually for focal length, and sometimes for iris aperture.

Vari-Focal, Auto-Iris Lens – these are also generally CS-Mount lenses which can be adjusted manually for focal length (to obtain the best field of view) but also have a Direct-Drive Iris (driven from the camera itself) which automatically adjusts the exposure to match the lighting conditions. These lenses can only be used on ip cctv cameras which have Direct-Drive, Auto-Iris controls.

FAQ What is Network CCTV? What is a Network Camera? What is a Network Video Server? What is Network Video Management Software? What are Wireless Network Cameras? What is an Outdoor Camera? What are Day/Night Cameras? What is Video Compression? What is Power Over Ethernet (PoE)? What does Lux (light levels) mean? What are the various types of CCTV lenses? What are the different types of Video Sensor? What are the various Video/Exposure Controls?	What are the various types of CCTV lenses? What are the various types of CCTV lenses? Most of the network cctv cameras on this site come with one of the following lenses: Fixed Focus Board Lens – these are miniature lenses with a fixed focal length. In some cases the lenses may be exchangeable for Board Lenses of different focal lengths. See the individual camera data sheets for more details. Fixed-Focus CS-Mount Lens. The CS Mount lens is a common standard lens. This is of a fixed focal length, but can be exchanged for any other fixed focal length CS-Mount lens. These lenses can also be replaced by vari-focal lenses, where the lens focal length is set up on installation to get the best possible field of view. Beware, CS-Mount lens capability does not imply the ability to use auto-iris lenses, this is a separate feature. Vari-Focal Fixed-Iris Lens – these are generally CS-Mount lenses which can be adjusted manually for focal length, and sometimes for iris aperture. Vari-Focal, Auto-Iris Lens – these are also generally CS-Mount lenses which can be adjusted manually for focal length (to obtain the best field of view) but also have a Direct-Drive Iris (driven from the camera itself) which automatically adjusts the exposure to match the lighting conditions. These lenses can only be used on ip cctv cameras which have Direct-Drive, Auto-Iris controls.
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FAQ

What are the various types of CCTV lenses?

What are the various types of CCTV lenses?