18mm Focal Length Lens: CS mount lens is designed for 8.0mm focal length, 1/2in image size, 48 field of view, professional design offers more professional shooting to you. 2High Accuracy Focus: The CS mount lens with manual focus and adjustable aperture, and the easy to grip focus ring provides very accurate focus for highly accurate shots. 3Reliable Materials: The camera lens is made of premium aluminum alloy shell structure with excellent resistance to high temperature, not easy to rust or deform, durable. 4Excellent Performance: The 8.0mm focal length lens is strictly engineered and manufactured after extensive test, no lens shading, no dark corners, decent image quality. 5Wide Usage: High quality CCTV camera lens adopts CS mount design, you can get a bit more clarity and focus, recommended for home security system or DIY camera. Item Type: CS Mount Lens Material: Aluminum Alloy Focal Length: Approx. 8.0mm/0.31in Format: 1/2in D/f': 1.2 Mount: CS F.0.V (D/H/V): 48 Back Focal Length: Approx. 7.53mm/0.3in Iris: Manual, Lock MTF: 3 Mega Pixel M.0.D: Approx. 0.2m/7.9in Size: Approx. 30x34.00mm/1.2x1.3in 1 x CS Mount Lens