Explore Scientific Neutral Density FilterND 0.91.25in. To control the density of an image the Explore Scientific Neutral Density Filter is a neutral density filter that you manipulate the amount of light that is exposed to the film or sensor. For high contrast images the Explore Scientific Neutral Density Filter also reduces the intensity of the background illumination which makes the image appear brighter or darker. The Explore Scientific Neutral Density Filter also lessens the intensity of spurious colors that typically occur in images. Package Contents: Explore Scientific Neutral Density Filter Explore Scientific Neutral Density Filter 1.25 ND 0.9 with 13percent transmission