This 77mm 2-in-1 Filter from K&F Concept combines a 1 to 5-stop variable ND filter and a circular polarizer in a single design. It can be used to lower the exposure of your image and reduce reflections at the same time. Crafted with optical glass and featuring waterproof and scratch-resistant multicoating, this filter allows only 0.7% light transmission. The filter frame is made of aluminum and rotates between five ND designations.