Hoya B52CIRPLW 52mm Moose Peterson Warming PolarizerEnhance Your Images with Warmth and Polarization The Hoya 52mm Moose Peterson Warming Circular Polarizer Filter combines the benefits of a polarizer and a warming filter. Designed in collaboration with wildlife photographer Moose Peterson, this filter reduces reflections, deepens blue skies, and adds a pleasing warm tone to your images. Filter Type: Warming Circular Polarizer Size: 52mm Effect: Reduces reflections, darkens blue skies, adds warmth