Premium Quality: Made of Germany imported optical glass with almost zero light distortion. Featured with top level of filter function, effectively eliminate harmful reflective light. MRC Featured: Adopted 28-Layer multi-resistant coating technology, the green coating helps effectively reduce filter surface reflection and the ghosting while making the filter anti-scratch, water repellent, oil and dust resistant. Double Sides Polishing: Designed by double polishing technology, it helps you shoot a clear and natural color image even under a 500mm telephoto lens. Ultra Slim and Lightweight: Super slim and lightweight aluminum frame, maximum reduce impact on light and effectively avoid dark corner for wide-angle shooting. Security and Environmental Protection: Meet EU environmental standard of RoHS.