Cokin NNXSKY Nuances Clearsky X-Pro Light Pollution Filter

The Cokin NNXSKY Nuances Clearsky filter is a specialized tool for night sky photographers who want to minimize the impact of urban light pollution on their images. Built from optical-quality neodymium glass, this filter selectively absorbs the yellow wavelengths produced by sodium-vapor and mercury-vapor street lamps—the two most prevalent sources of light pollution in many cities and suburban areas. By filtering out these specific wavelengths, it allows the natural colors of stars, nebulae, and the Milky Way to come through with greater fidelity, reducing the warm orange-yellow color cast that plagues long-exposure night photography near populated areas.

Designed for the Cokin X-Pro Series holder system with a 130mm width, the Clearsky filter is well-suited for use with wide-angle lenses commonly employed in astrophotography. The neodymium glass construction ensures that sharpness is maintained across the frame, and the filter's selective absorption profile means it works without drastically reducing overall light transmission. Photographers working in areas still illuminated by traditional sodium and mercury-vapor lamps will find this filter particularly valuable, though those shooting in regions that have adopted LED street lighting should be aware that the Clearsky's effect will be less pronounced against those broader-spectrum light sources.