Applicable Models: There are three kinds of interfaces: 82mm/3.2in, 77mm/3.0in, 72mm/2.8in, suitable for 82mm, 77mm, 72mm interface lens. Aluminum Alloy Frame: CNC precise machining, screw thread installation, quick and convenient disassembly and assembly. Multi Layer Nano Coating Process: Lens has waterproof, oilproof, , and anti scratch properties to protect the lens from dust and scratches. Usage Scenes: Suitable for shooting in seaside, mountain, snow field and open area, etc. It can reduce the blue tint caused by ultraviolet rays. Use Purpose: Can also eliminate the interference of ultraviolet rays on CCD, which helps to improve the effect of clarity and color reproduction.