Item Type: Lens Filter Material: Aluminum Alloy + Optical Glass Application: for AIR 2S Product Size: Approx. 2.9 x 2.4 x 0.5cm / 1.1 x 0.9 x 0.2in Weight: Approx. 24g/0.8oz Package List 1 x Lens Filter 1The lens is made of highquality optical glass, highdefinition grinding treatment, and the frame is made of aviation aluminum. 2The lens has waterproof, oilproof, antifouling, and antiscratch properties, so that water droplets and oil can not be absorbed on the surface, making it easier to clean and maintain. 3The multilayer nanometer coating process makes the surface of the lens form a protective layer similar to the surface of the lotus leaf. 4CPL is a commonly used filter, which eliminates unnecessary reflections and can eliminate most of the reflections on nonmetal aspheric surfaces. 5CPL filter is generally used for landscape photography, the sky is bluer when shooting, and the reflection on the water surface is eliminated when shooting the water surface, making the whole picture more clear.