The 55mm Nano-X Pro Series Variable ND Filter from K&F Concept is a 3 to 7-stop filter featuring titanium coating. The coating ensures color accuracy during video capture by eliminating yellow tint. Additionally, grinding and polishing technology applied on both sides of the filter ensures accurate HD quality images without loss of sharpness. The filter surface is also oxidized and sandblasted to minimize stray light and reflections. The filter is made with Japanese optical glass with a double-sided 28-layer nano coating that makes the filter waterproof, oilproof, scratch resistant, and easy to clean. The filter frame rotates steplessly between five ND designations and has a self-locking feature.