Kenko's circular ND filter. ※ Please take a look at my other listings for various other filters. ■ Referenced from the manufacturer's website The PRO1D ND filter series employs the PRO1D ND coating, which emphasizes flat transmission characteristics. It's a slim-frame type compatible with wide-angle to telephoto lenses. It has extremely high neutrality and is a neutral gray filter with excellent color reproduction. It is used when you want to adjust only the amount of light without affecting the colors. The outer circumference is ink-coated to reduce internal reflections, preventing flares and ghosts caused by the filter. It features a knurled (non-slip) filter frame for ease of handling during attachment and detachment. ND16 reduces the amount of light to 1/16, which is equivalent to a 4-stop reduction in light. It is ideal for expressing waterfalls and streams with slow shutter speeds, or when you want to open the aperture and blur the background on a sunny day. ■ PRO1D ND Coating Employs the PRO1D ND coating, which emphasizes flat transmission characteristics. ■ Black Ink Coating on the Glass Outer Periphery The outer periphery of the filter glass is coated with black ink to reduce internal reflections. ■ Slim-Frame Type with Knurling A slim-frame type compatible with wide-angle to telephoto lenses. It features a knurled (non-slip) filter frame for ease of handling during attachment and detachment.