The B + W filters are made of brass alloy with excellent physical properties and high-purity, distortion-free, thick Schott glass, with a particularly precise design, state-of-the-art manufacturing technology and the highest quality standards. Finally, different types of surface treatment are provided to complete the perfection of B + W filters. From the raw materials used to the final touches, 100% "Made in Germany". B + W UV filters (factory code: 010) are primarily used to physically protect the front lens of the lens. The wavelength range of less than 300 nm is blocked and then passed through with increasing intensity. From about 430 nm with an absolute minimum light loss (<0.5%), they transmit reality to the lens. In the case of digital machines (except in extreme situations), no difference is detected between the use of clear and UV filters. In the case of negative films that are sensitive to UV radiation, the UV filter prevents a single blue shift and lightening, e.g. in high mountains, at sea, or in places with extremely clean air. This filter is equipped with eight layers of surface treatment (MRC) on both sides, which provide anti-reflection and dirt resistance, among other things. This filter is made with an F-pro socket, which is a standard B + W socket that is also great for use with wide-angle lenses. They are also equipped with a front thread, so that an additional filter (eg CPL) or accessory can be attached, as well as internal nail lens caps.