Heliopan 58mm Skylight Filter, KR 1.5, SH-PMC 16 Layer Super Hard Multi-Coated

Heliopan glass filters are made exclusively with glass from Schott (Zeiss) the world's finest optical glass supplier. Heliopan filters are "dyed in the mass" and ground, polished and coated to the highest standards of the German optical industry. All Heliopan screw in type and series size filters are mounted in precision black anodized brass rings to eliminate binding or cross threading and to ensure optimal alignment. The care, quality and performance of Heliopan's filters make them simply the world's finest filters! Each Heliopan filter has an anti reflective coating, scratch proof metallic oxide coating on each surface. This special hard coating reduces reflections by approximately 50%. Heliopan filters are referred to as double coated. This means that the front and rear glass surfaces have coating applied to them.