Active photography places high demands on cameras and lenses. It makes sense 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 permanently in front of the lens as they are completely color-neutral, offer 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 dirt on image quality. Especially with zoom lenses of lower brightness, fingerprints can significantly negatively affect sharpness. However, frequent cleaning of the front lens is not ideal.