Feature: 1. CPL filter, also known as circular polarizer filter, is mainly used to eliminate reflections on non-metallic surfaces, increase saturation and restore true colors. It is often used in landscape photography. 2. Play a good role in eliminating reflection, improve the picture clarity and performance. (note: when using CPL, the shooting angle should be less than 45 ° with the reflective surface, and the frame should be rotated to adjust.) 3. CPL can deepen the primary color tone of blue sky, highlight the sense of cloud layer, and eliminate the reflection of water and plant surface, making the water more thorough and the plant more colorful. 4. Protect lens from scratches and stains. 5. Essential for outdoor photography, can help you get better quality images. Specification: Condition: 100% Brand New Item Type: Lens Filter Material: Aluminum + optical glass Color: as picture shown Compatible model: for Osmo Action. Package List: 1 x Lens Filter1 x Storage Box1 x Manual