The Hoya 82 mm C2 Blue Cooling Color Correction Multi-Coated Glass Filter is a precise optical accessory for professional photography applications. This filter provides a cooling effect of 200 Kelvin with a Mired shift of -20, effectively balancing the color temperature when using tungsten-balanced film with warm light sources over 3200 Kelvin. Constructed from multi-coated glass, the filter features Hoya HMC technology, which minimizes reflections, reduces stray light and ghosting, and achieves an average light transmission of over 97 percent. With a diameter of 82 mm and standard screw mount, this filter is particularly useful for correcting color balance in shots under warm artificial lighting conditions such as incandescent bulbs or candlelight. It also serves to cool excessively warm scenes when using daylight-balanced film at 5500 Kelvin, especially in sunrise and sunset photography. The multi-coating technology enhances compatibility with modern multi-coated lenses while maintaining optical clarity and color accuracy. The durable glass construction ensures long-term reliability and consistent performance under various shooting conditions. This filter aids photographers in achieving precise color correction without digital post-processing, making it valuable for film and digital photography workflows where accurate color representation is essential.