1、MANUAL ADJUSTMENT: C mount film lens is simple to use and the aperture can be manually adjusted according to the available light level. 2、ADVANCED OPTICS: C mount camera lens uses advanced optics to ensure all around clarity and efficient light guidance. 3、WIDEST FIELD OF VIEW IMAGE: C mount CCTV lens has low distortion and provides you with the widest field of view image that a C interface lens can offer. 4、RUGGED AND DURABLE: F4 CCTV lens features an aluminum housing and glass lens. It is rugged and resistant to damage and has a long service life. 5、RANGE OF APPLICATIONS: 25mm F4 CCTV lens is perfect for bars, stores, parking lots, houses and warehouses, etc. 1 x 25mm F1.4 CCTV Lens Item Type: 25mm F 1.4 CCTV LensMaterial: Aluminum, GlassOriginal Focal Length = 25mm / 1inMounting Type: C MountAperture: F 1.4Aperture Operation: ManualFocusing Operation: ManualViewing Angle: 19.6Object Distance (OD): Approx. 30cm / 11.8in