Lee Seven 5 Circular Polariser When light from the sun bounces off a flat non metallic surface, such as glass or water, it becomes polarised with all of the reflected light waves vibrating in the same plane. This reflected glare can be removed by the polarising filter. There are two types of Polariser, circular & linear. These names bear no relation to the physical shape of the filter itself but refer instead to the way the light waves are transmitted through the filter to achieve the polarising effect. Aunique clip-on design means this can be snapped onto the front of the Seven 5 Holder & rotated independently of any graduated filters also in use. Looking for the right Lee Filter for you? Use Lee’s System Match tool to find what’s compatible with your equipment.