Feature:1. Main Parameters: CS mount lens, resolution 3MP, focal length 4.0mm, format 1/2in, relative aperture 1.2, field of view 76 degrees.2. Easy to Focus: The focusing ring, which is easy to hold, provides very accurate focusing for high quality recordings.3. High Image Clarity: CCTV lens has manual focus and adjustable aperture, no lens shadow, no vignetting, good image quality.4. Premium Material: High quality aluminum alloy shell, temperature resistance, can adapt to different outdoor environments.5. Wide Application: CS mount lens can get more clarity, focus, suitable for home security system and video surveillance etc.Specification:Item Type: CS LensMaterial: Aluminum alloyFocal Length: Approx. 4.0mm/0.16inFormat: 1/2inRelative Aperture (D/f'): 1.2Interface (Mount): CSField Of View: 76Back Focal Length: Approx. 12.5mm/0.49inAperture: Manual/Lock (W/Lock)Resolution: 3MPClose Up Distance: Approx. 0.2m/0.66ftSize: Approx. 30x32mm/1.18x1.26in.Package List:1 xCS LensNote:The optical coating is very important for the imaging of the lens, and it needs to be handled with care to avoid scratching the coating.