67mm Black Mist 1/4 + ND2-400 Variable ND Filter

K&F Concept 67mm Black Mist 14 + ND2-400 Variable ND Filter with Double-sided 28-layer Anti-reflection Green Film and Lever Nano-X Series 【2-in-1 set】 Multi-function ND2-400 & Black Mist 14 filter, one filter has two functions, it can be used as a light filter or a black mist filter 【Thin frame & large friction】 The surface of the frame is designed with CNC trapezoidal pattern to ensure a large area of friction when rotating, so you can installremove the lens and other accessories anytime, anywhere. The frame is made of aviation-grade aluminum, and the 7.4mm thin frame design ensures that there will be no vignetting at both the wide-angle end and the telephoto end 【28-layer coating & 84% transmittance】 Top optical glass, the lens adopts double-sided 28-layer anti-reflection coating on both sides, which can effectively reduce filter reflection, and perfectly achieve the 84% transmittance of 14 black mist filter standard. The optical glass is finely ground and polished on both sides to ensure the stability of the molecular structure, which does not affect the sharpness of the telephoto lens and ensures high-definition imaging 【9 f-stops】 9 stops infinitely adjustable dimming, quickly adjust the amount of light entering 【Coating and anti-fouling】The glass double-sided coating is anti-mildew, waterproof, anti-scratch, and anti-oil, even if it is contaminated with water droplets or oil, it can be easily removed