The Hoya 72 mm W2 Umber warming filter for color correction, made from multi-coated glass, is designed for photographers who require precise color temperature adjustments. This professional filter warms the ambient light by 200 Kelvin (+20 Mired shift) and introduces a subtle amber hue to correct cooler light sources and achieve balanced exposures. Crafted from multi-coated optical glass, it offers an average light transmission of over 97 percent while minimizing reflections, flare, and ghosting for optimal image sharpness. The filter thread with a 72 mm diameter ensures compatibility with corresponding lenses. Ideal for daylight-balanced films around 5500 Kelvin, this filter effectively reduces blue casts while simultaneously enhancing yellow and orange tones. It works exceptionally well in overcast conditions, in the shade, and in portrait photography, where a natural warmth of skin tones is desired. The robust glass construction withstands regular use under various shooting conditions. Landscape photographers benefit from the enhanced golden tones it provides during sunrise and sunset. This color correction tool preserves color accuracy and delivers consistent warming effects in different lighting situations.