Active photography places high demands on cameras and lenses. It is important to protect the sensitive front lenses from flying sand, dust, fingerprints, or splashes with a B+W filter. B+W filters not only cost a fraction of the lens but are also easier to clean. They can remain on the lens at all times, as they are completely color neutral, have high transparency, and are extremely low in reflection due to the MRC or MRC nano coating. The optical signal reaches the image sensor unaffected. With the clear and highly transparent B+W protection filters, no extension factor needs to be considered. In digital photography, protection filters play a particularly important role. A greater depth of field due to smaller sensors amplifies the impact of front lens contamination on image quality. This is especially true for zoom lenses with lower light intensity, where fingerprints can significantly reduce sharpness. However, frequent cleaning of the front lens is not ideal.