The Hoya 55mm C8 Blue Cooling Color Conversion Multi-Coated Glass Filter is designed to correct color temperature imbalances in photography. It specifically adjusts 3800 Kelvin tungsten warm light sources to match 5500 Kelvin daylight-balanced films. This is achieved by cooling the light by 1700 Kelvin, corresponding to a -80 Mired shift. It imparts a dark blue tint to exposures for accurate color reproduction under warm lighting such as incandescent or halogen lamps. This filter is also versatile for creative applications, such as creating a day-for-night effect with daylight film, especially on overcast days. Constructed with Hoya Multi-Coat (HMC) technology, it minimizes reflections, flare, and ghosting while ensuring over 97 percent average light transmission for clearer, more vibrant images. The robust glass construction and multi-coating enhance compatibility with modern multi-coated lenses, supporting both professional and amateur photographers in challenging lighting situations. With a 55mm thread size, it seamlessly integrates into various camera configurations, emphasizing reliability and optical precision for consistent performance in color conversion tasks.