These cameras offer high quality picture with the popular C/CS mount for a variety of lens choices. Box Style or CCTV cameras have long been a staple of the security industry. This type of camera affords the most versatility when choosing a lens. They use a C/CS type lens mount which makes it quick and easy to change the lens for different fields of view. Field of View (FOV) is the maximum viewed image (area covered) a lens sees and displays on your TV or monitor. CCTV Cameras can also be equipped with a number of varifocal lenses. Varifocal lenses allow you to change the focal length or field of view to accommodate a variety of situations. However for outdoor use, they will require a weatherproof housing.