1. Protect your expensive lens from dust and scratch while not lowing your photo quality. 2. CPL filters increases color saturation, creating deep, rich scenic images. Helps to reduce the amount of light entering the lens. Removes unwanted reflections from non-metallic surfaces such as water or glass and glare from the sun. 3. ND filters washed out photos & video due to bright sunlight for better contrast & rich color. Significantly reduce lens flare and ghosting while making the filter anti-scratch, reduce reflection, increase surface durability, water resistant, oil & dust resistant. 4. Portable and durable, easy to install. 5. Lightweight, high transmittance and low reflectivity.