The 77mm Nano-X Series 2-in-1 Variable ND & CPL Filter from K&F Concept rotates to reduce light by 2, 3, 4, 5, or 6 stops while also applying circular polarization. The filter is made with 28-layer multicoated optical glass. The filter frame features two orange levers and self-locking technology. The surface of the frame offers a trapezoidal pattern for improved handling and is treated with oxidation sandblasting to minimize the entry of stray light.