The Hoya 49 mm W12 Umber warming color conversion filter with multi-coating is designed for photographers who require precise color temperature adjustments in challenging lighting conditions. This professional filter provides a significant warming effect of 2200 Kelvin with a Mired shift of +120, creating a rich amber tone that transforms cool light sources into natural, inviting hues. With a diameter of 49 mm and a multi-coated glass construction, it compensates for tungsten film in daylight and corrects blue casts from studio lighting. Hoya's advanced multi-coat technology minimizes reflections, reduces lens flares and ghosting while maintaining light transmission of over 97 percent for optimal image sharpness. Ideal for use with tungsten-balanced films like Cinestill 800T, this filter offers stronger warming than the W10 model, making it well-suited for achieving a neutral color balance with standard tungsten films. The precision-crafted glass design ensures consistent performance in various lighting situations, from indoor flash photography at 5500 Kelvin to daylight correction outdoors. With its durable, multi-coated surface and reliable color conversion capabilities, this filter preserves color fidelity while protecting lens elements. The 49 mm thread size ensures compatibility with a wide range of camera lenses, providing photographers with a versatile tool for creative color control and technical correction in both studio and field settings.