Security camera lenses A security camera lens size determines the field of view and the amount of image captured by the security camera lens. for example: a 2.8 mm lens provides an approximate 95-degree field of view and 3.6mm lens is designed to provide an approximate 78° field of view, there's not a huge difference between a 2.8mm and 3.6mm lens. Varifocal cameras A varifocal camera allows you to manually zoom in or out during installation. This means one camera is able to perform different jobs The distance at which a number plate or a person can be identified using standard definition CCTV. For HD1080P systems you can: check these number:
2.8mm lens 4.9ft 3.6mm lens 9.8ft 6mm lens 16.4ft 9mm lens 19.6ft 12mm lens 22.9ft 22mm lens 39.3ft 60mm lens 114.8ft |