The Leica E82 UVa II Filter is specifically designed to prevent ultraviolet light and reduce the bluish cast of daylight from appearing on your images. The filter also includes multiple of layers of anti-reflection coatings to prevent internal ghosting and reflections from taking place. Additionally, the filter is constructed from optical glass for clarity as well as colour fidelity; and the filter is carefully designed to mount onto a lens with 82mm front filter threads.