The DHG ND filter controls the amount of light and allows you to adjust the shutter speed. It's ideal for preventing overexposure and preventing loss of image quality in digital images due to aperture settings that are too narrow. Aperture equivalent: 4 stops, Light intensity: 1/16/[DHGND1677MM]DHGND1677MM The DHG ND filter controls the amount of light and allows you to adjust the shutter speed. It's ideal for preventing overexposure and preventing loss of image quality in digital images due to aperture settings that are too narrow. It reduces the amount of light without affecting the color of the subject, allowing even beginner photographers unfamiliar with slow shutter speeds and aperture settings to achieve unique photographic results. Aperture equivalent: 4 stops, Light intensity: 1/16 ■ Specifications ■ Filter diameter: 77mm