Urth 86mm Circular Polarizing Filter with Rotating Adapter for 100mm Square Filter Holder (Black)The Urth Professional 86mm Circular Polarizing Filter Plus with Rotating Adapter Ring is made for use with the square filter holder system. This CPL filter plus cuts polarized light and reflections to increase contrast and boost colors. Filter Holder System Polarized light can wash out images with silvery reflected light, which is why this CPL Polarizer cuts out 99. 9 percent of reflected light from water, glass, and non metallic surfaces, uncovering