Features: 1. ND-2: 1st stop and 50% less light; 2. ND-4: 2 stops of aperture and 75% less light; 3. ND-8: Can reduce 3 stops of aperture and 87.5% of the amount of light; 4. ND-400: It can reduce the light amount of 9-stop aperture, suitable for long time exposure during the day and shooting the sun 5. When the focal length of the lens is in the ultra-wide-angle range and the aperture value is F2.8, if the filter is adjusted to the maximum density for use, there may be more obvious "cross" light spots or slight color shift. In order to ensure that the image is not disturbed, we recommend that you reduce the density value of the filter at this time until the disturbing light spot disappears, and then you can shoot normally. parameter: Caliber: 77mm Weight: 99g Material: aluminum magnesium alloy, optical glass Colour: Black