The ND3.0 10 Stop ND Filter is the ultimate filter for Landscape Photographers. This filter reduces the amount of light passing through the camera lens by approximately 10 stops without changing the color of the scene. They are especially useful in bright light conditions to help prevent overexposure. Neutral Density filters also allow proper exposure at a wide lens opening for reduced depth-field to highlight subground subject. and/or background out of focus. us. a process that entails permanently laminating the filter material in between two pieces of optical glass that are ground flat to tolerances of a ten-thousandth of an inch, then mounting them in precision metal rings. This allows us to control the color and density of filters, and the characteristics of special effects filters with much greater accuracy than the typical dyed-in-the-mess. ass filters, which usually exhibit color and density variations.