Light pollution doesn't only adversely affect the quality of night-time city and architectural photographs but also scientific astrophotography in urban areas. K&F Concept Round Filter helps to reduce the unwanted effect of light pollution, giving photographs more contrast and clarity as a result. * K&F Concept Natural Night Filters made of double side Nano-Coating use waterproof and scratch-resistance technology ,bring the high-quality definition, low-reflection and no Vignetting. * Block the most common wavelengths of light pollution in the night sky,Significant improvement in the colours throughout the whole scene * With only 2mm thickness and 100*100mm size, No Color Cast is made with premium Japanese Optics glass. * Suitable for Canon 16-35,Canon 24-70,Nikon 24-70,Nikon 70-200 and other 52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm lens, compatible with Lee Cokin Hitech Singh-Ray and other brand holder