The B+W Ultra Violet (UV) filter blocks UV rays from entering the lens. UV rays are Usually blocked via most digital sensors making the UV filter most commonly used on film camera’s rather than digital as film is effected by UV light causing blurring and a blue colour casts.
This UV filter is colour neutral and has no multiplying factors. The ring is made from brass that is matte black to prevent reflections. The ring has a front thread for additional accessories such as lens caps or hoods.