The RevoRing Variable ND3-ND1000 and Circular Polarizer Filter from HnY Filters provides a combination of a variable neutral density filter with a 1.5 to 10 stop increase in exposure, paired with a circular polarizer. The combination of these functions results in a filter well suited to landscape photography and more. The RevoRing is a unique adapter ring with unique self-retracting blade technology with threaded ends to secure to the front of any lens with a filter thread size of 67-82mm. Each threaded blade has been designed to overlap, completely removing any possibility of light leaks.