1、Focal Length: With 6 adjustable aperture manual focus lenses of 4mm, 6mm, 8mm, 12mm, 16mm and 25mm, you can get more clarity, focus image. 2、Characteristic: This is a 6 piece CS Mount Lens kit, each lens is 3MP, the image format is 1/2in, the field of view is 76°, 63°, 48°, 28.5°, 23° and 16.7°. 3、Accurate Focus: The digital camera lens is designed with an easy to grip focus ring, which provides very accurate focus for highly accurate shots. 4、Premium Material: The shell of the camera lens is made of aluminum alloy material, resistant to high temperature, waterproof, will not rust and durable. 5、Simple Operation: Manual iris lens can be used in home security system, DIY development, easy to install and disassemble without affecting the installation and use of other accessories. 6 x CS Mount Lens Item Type: CS Mount Lens KitMaterial: Aluminum alloyApplication: Surveillance camera replacement lens, DIY lensFocal Length: 4mm, 6mm, 8mm, 12mm, 16mm, 25mmField of View D H V: 76°, 63°, 48°, 28.5°, 23°, 16.7°Format: 1/2inRelative Aperture: 1.2 D/f'Interface (Mount): CSAperture (iris): Manual Lock (With Lock)Resolution (MTF): 3 Mega PixelM.O.D: 0.2m