The Haida NanoPro MC Clear-Night Filter from Haida is designed to reduce the appearance of light pollution in images or video that include the night sky, and to minimize illumination from artificial light sources. This effect can be obtained when the filter is used on a film camera system with daylight film installed, or on a digital camera system with the daylight white balance setting selected. The NanoPro MC Clear-Night Filter can improve the results of nighttime images by absorbing the yellow light from sodium-vapor lamps, a common light source within urban areas. By preventing the dominant wavelengths of light associated with the color of those lamps from being recorded, the filter enhances visibility of astronomical objects. It ensures that, in the places where they do appear, artificial light sources are more clearly defined, with less glare and improved contrast. To prevent internal ghosting and reflections, each glass surface includes 10 layers of antireflection coatings which offer protection for the filter itself. Reduces Light Pollution for Crystal Clear Night Skies Does not require adjustments to exposure while in use. Creates no additional coloration or contrast. K9 Optical Glass for clarity and consistent color reliability Multi-coated (10 Layer) to prevent internal ghosting and reflections. Nano coating provides an additional layer that results in an improved beading effect when in contact with water or oil for greater cleaning efficiency. Ultra Slim aluminum alloy filter ring is only 3.1mm. Ideal for wide angle lenses, helps prevent vignetting while remaining durable and lightweight. Front frame is threaded for use with multiple filters / hoods / caps Plastic case for storage and transport.