The Cokin Clearsky Light Pollution filter targets and blocks a specific yellow/orange area of color that common street lamps emit. The sodium and mercury vapor lamp spectrums are bright and travel great distances which makes them great for lighting up your streets at night but a nightmare for astro and cityscape photographers. That yellow/orange glow can be seen many miles from the source and becomes even more apparent in long-exposure astro-photographs. Reviews There are no reviews yet. Be the first to review “Cokin Nuances Clearsky Light Pollution Filter” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.