This is a high-precision filter with a special multi-layer coating applied using vacuum deposition technology. It has extremely high neutrality and is a high-precision neutral gray filter with excellent color reproduction. This is a 77mm Kenko PRO ND4 filter, used to adjust the amount of light and achieve smooth images. - Brand: Kenko - Model: PRO ND4 - Size: 77mm - Type: ND Filter The ND4 reduces the amount of light to 1/4, which is a reduction of 2 f-stops (25% transmittance). It reduces only the amount of light without affecting the colors. It is used when you want to lower the shutter speed or to avoid diffraction caused by stopping down the aperture, such as to f/22. There is a small scratch on the 77mm side of the filter frame. There are no scratches on the filter itself, and it is in very clean condition as it has been used very little.