1、The lens is made of high‑quality optical glass, high‑definition grinding treatment, and the frame is made of aviation aluminum. 2、The lens has water‑proof, oil‑proof, anti‑fouling, and anti‑scratch properties, so that water droplets and oil can not be absorbed on the surface, making it easier to clean and maintain. 3、The multi‑layer nanometer coating process makes the surface of the lens form a protective layer similar to the surface of the lotus leaf. 4、CPL is a commonly used filter, which eliminates unnecessary reflections and can eliminate most of the reflections on non‑metal aspheric surfaces. 5、CPL 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. 1 x Lens Filter Item Type: Lens FilterMaterial: Aluminum Alloy + Optical GlassApplication: for AIR 2SProduct Size: Approx. 2.9 x 2.4 x 0.5cm / 1.1 x 0.9 x 0.2inWeight: Approx. 24g/ 0.8oz