Brand: K&F Concept Material: Optical Glass Photo Filter Thread Size: 55 mm Coating Description: nano_coating Photo Filter Effect Type: Polarizing Model Number: KF-55BD1/4 Filter Diameter: 55mm Coating: MRC Nano Coating Frame: Thin frame design to reduce vignetting Glass: German SCHOTT B270 optical glass 【Black Diffusion】 By diffusing light, it creates flares and produces a unique, warm, and soft cinematic expression. I made a mistake and bought the wrong lens diameter, so it's like new since I haven't used it. Hoping someone can use it.