Cokin CNSKY-58 Nuances Clearsky 58mm Light Pollution Filter

The Cokin CNSKY-58 Nuances Clearsky is a screw-in light pollution filter built for photographers who want to shoot the night sky from locations affected by urban glow. Its optical design targets the specific wavelengths produced by sodium-vapor and mercury-vapor street lamps—the two most common sources of the yellowish haze that obscures stars and the Milky Way in suburban and semi-rural areas. By selectively absorbing those wavelengths, the filter lets more of the natural sky color through, producing cleaner, more contrast-rich images straight out of camera.

The 58mm glass element features Cokin's multi-coating, which serves double duty: it minimizes internal reflections and ghosting (important when shooting toward bright point-light sources like stars), and it provides practical protection against oil from fingerprints, dust, and scratches. The water-beading effect also makes the filter easier to wipe clean during dewy nighttime sessions. With a filter factor of just 1.5x (+0.6 stops), the exposure penalty is relatively mild, keeping shutter speeds manageable for star photography where every second of exposure matters.