The Marumi DHG ND (Digital High Grade Neutral Density), also known as a gray filter, allows you to control the bright light entering the lens. These ND filters are equipped with a special coating that significantly reduces the reflection of incoming light without disturbing the color balance. This has a certain effect on the photo. If there is too much light or if you want to use a different aperture at the same exposure time, you should use a neutral density filter. The light intensity is reduced by this filter. The Marumi DHG ND 8 filter can delay a specific aperture by 3 stops. This means a longer shutter speed at the same aperture. Therefore, you do not need to close the aperture further if you desire a longer exposure time. This longer exposure time allows you to capture movement in a photo. A good example is a photo of flowing water, as shown in the illustrations.