Compatible with matte boxes that support 4×5.65′′ filters with 4mm thicknessThe NiSi Cinema Yellow Light Blocker (Natural Night) is designed to reduce the appearance of light pollution in video or images that include the night sky and illumination from artificial light sources. Light pollution occurs in areas of the night sky that are above or near concentrated and intense sources of artificial light such as cities. These light sources can include exterior and interior lamps for commercial or residential buildings, brightly lit advertisements as well as sports and entertainment venues. Additionally, artificial lights clustered together can become difficult to discern individually. Light pollution from these “cluttered” sources can become a source of distraction within an image and can resemble overexposed areas of glare. When used, the NiSi Cinema Yellow Light Blocker (Natural Night) can improve the results of nighttime images by blocking the yellow light from sodium-vapor lamps, mercury-vapor lamps, or low Color Rendering Index LED’s, conventional light sources within urban areas. By preventing the dominant wavelengths of light associated with the color of those lamps from being recorded, the visibility of astronomical objects is increased, and where they appear, artificial light sources are more clearly defined with less glare and improved contrast. This filter is compatible with filter holders or matte boxes that can accommodate 4mm-thick rectangular filters and are constructed from optical glass for clarity as well as color fidelity. Each glass surface includes one layer of nano-coating. The nano-coating associated with this filter results in an improved beading effect when in contact with water or oil for higher cleaning efficiency. A leatherette pouch is included with this filter for storage and transport.