The latest addition to the B+W XS-Pro filter line up, this Neutral Density filter utilizes the latest in thin film technology, resulting in an improved ND effect for even truer neutrality. With a light intensity reduction of ten f-stops, its principal field of application is the observation and documentation of industrial processes with extreme brightness, such as steel furnaces, incinerators, glowing filaments in halogen- and other bulbs. The filter factor is 1000x