The Hoya 82 mm W12 Umber Warming Filter is a multi-coated glass filter designed for color temperature adjustment in photography and videography. It warms ambient light by 2200 Kelvin, corresponding to a Mired shift of +120, and imparts a dark amber tone for color balance correction. This filter is particularly effective when using tungsten-balanced film like Cinestill 800T, neutralizing the blue cast that often occurs in daylight or with 5500 Kelvin light sources such as studio flashes. Compared to the W10 model, the W12 offers a stronger warming effect, resulting in more natural and neutral color reproduction. Utilizing Hoya Multi-Coat (HMC) technology, it minimizes reflections, reduces stray light and ghosting, achieving over 97% average light transmission for enhanced optical performance with multi-coated lenses. Made from high-quality glass, it ensures durability and reliability for professional and enthusiast applications in various lighting situations, supporting precise color correction without compromising image sharpness.