For this high-end polarizing filter the foil pieces are selected individually for maximum color neutrality. Following cementing between high-grade optical glass, additional grinding and polishing takes place. This guarantees outstanding sharpness even with very bright, apochromatic lenses. The latest cementing technique ensures lasting stability even in damp climates. Available in the Professional Line as linear and circular polarizing filters, and some circular filters also come with MRC. Available in the Premium Line as circular polarizing filters with MRC nano finish.