Become a master of capturing stunning, high-contrast images with the 67mm Warm Circular Polarizer Glass Filter, a unique product born from the exclusive collaboration between Hoya and esteemed wildlife photographer and conservationist B. Moose Peterson of Wildlife Research Photography. This innovative filter combines the power of a polarizer and an 81A warming filter, making it an essential tool for photographers aiming to enhance their scenic photography.For decades, photographers have relied on polarizers to eliminate reflections from non-metallic surfaces like water and glass, and to intensify the contrast in blue skies. However, traditional linear polarizers can cause exposure errors with today's auto-focus camera bodies that use split beam metering systems, which employ a polarized half mirror. This is where our circular polarizer comes into play, providing the same optical effect without interfering with modern metering systems.One common issue with both linear and circular polarizers is their tendency to ""cool down"" or lend a slightly bluish tint to the overall color balance of a scene. Our 67mm Warm Circular Polarizer Glass Filter addresses this issue with the addition of the 81A glass. This component corrects the color temperature, restoring the scene to the original 5500K, which is ideal for daylight film's color balance. The result A more pleasing, warm color balance across your entire scene. Plus, the circular polarizer enhances color contrast and minimizes the effect of atmospheric haze. Whether you're shooting landscapes, wildlife, or urban scenes, this versatile and high-quality filter is a valuable addition to your photography gear..