This 2-in-1 Nano-X Series Variable ND2-400 & Black Mist Filter from K&F Concept provides a 1 to 9-stop light reduction for motion blur, shallow depth of field in bright conditions, and smooth cinematic video without overexposure, while the 1/4-grade black mist layer softens contrast and diffuses highlights. Its optical design features a 28-layer nano coating that resists water, oil, and fingerprints, eliminates ghosting and flare, and delivers ultra-low reflectivity. Made of optical glass and CNC-machined aluminum, it has an ergonomic tabbed rim design for smooth, precise adjustments. A protective case is included.