Item Type: C Mount Lens Material: Aluminum alloy Focal Length: Approx. 25mm/0.98in Format: 1in (Diameter 16mm/0.63in, 12.8x9.6) Relative Aperture (D/f): 1: 1.4 Mount: C Mounts Field Angle: 1in, 28.9x21.8 2/3in, 20.1x15.2 1/1.8in, 16.5x12.4 1/2in, 14.5x10.5 Flange Back Focal Length: Approx. 17.53mm/0.69in Aperture (Iris): Manual/Lock (W/Lock) Distortion: 0.25% Resolution: 10MP Close Up Distance: Approx. 0.25m/0.82ft Dimension: Approx. 40.0x56mm/1.58x2.2in Filter Size: M37.5x0.5p Application: Surveillance camera replacement lens, DIY lens Package List 1 x C Mount Lens 1 x Adapter 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. 1Important Parameters: C mount lens, 1in image size, 25mm focal length, 10mp pixel lens, relative aperture(D/f) 1:1.4. 2Good Image Quality: Optical coating makes your lens clearer and less prone to distortion, you need to be careful in use to avoid scratches. 3Manual Iris Lens: C mount lens with manual focus and adjustable aperture, no lens shadow, no vignetting, high image quality. 4Long Durability: The lens shell is made of high quality aluminum alloy, which is resistant to high temperature and durable. 5Wide Application: C mount lens is widely used in home surveillance cameras, CCTV, TV cameras, video camera, DIY lenses, etc.