The Clear-Night Filter for Sigma 14-24mm f/2.8 DG DN Art Lens for Sony E 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 digital camera system with the daylight white balance setting selected. | 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 sources can include streetlamps, exterior and interior lamps for commercial or residential buildings, sports and entertainment venue lighting, and brightly lit advertisements such as billboards. | The Clear-Night Filter is a rear-mounted filter that 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. | To prevent internal ghosting and reflections, each glass surface includes 10 layers of anti-reflection coatings, which also offer greater protection to the filter substrate and help keep it clean for a longer period of time. The Nano coating associated with these neutral density filters provides an additional layer that results in an improved beading effect if their surfaces come in contact with water or oil, allowing for more efficient cleaning. | Please confirm the camera SLR lens brand type before ordering. Your camera's lens brand type will be marked somewhere on the lens barrel.If you have any questions about Haida products, you can contact us at any time.