Sigma CPL-21 Water-Resistant Circular Polarizer Filter (77mm)

Featuring a fully revamped physical design, this 77mm CPL-21 Water-Resistant Circular Polarizer Filter matches the visual identity and pristine optical quality of Sigma lenses. Fashioned from clear optical glass, the filter eliminates reflections and glare from water and glass, reducing haze and increasing contrast and color saturation. It protects the front element of your lens against dust, dirt, and scratches, and has a water-resistant optical coating that repels liquids.