The B and W 55mm XS-Pro 802 ND Filter reduces the exposure by 2 stops, thus allowing you to lower the shutter speed and increase the aperture during image capture. This filter has a slim brass mount that makes it possible to fit onto mirrorless and DSLR cameras. The filter is developed through a thin-film technology, which layers three different coatings on it. The inner coating reduces reflections and improves image saturation while the outer layer ensures easy cleaning of dirt and moisture. You can mount a lens cover or hood onto the front 55mm accessory thread.