These versatile filters are designed to enhance skin tones and are also perfect for outdoor photography, improving the hues of foliage and earth under overcast conditions or in shade on sunny days. The filter adds warmth to complexions and is ideal for portraits. It absorbs the blue cast caused by certain light sources and can often be used in combination with other filters, such as graduated filters, for landscapes. It is sometimes used as a warmer alternative to the UV filter. Available in densities 1, 2 and 3. The filter is also available in 100x144 mm, 144 mm, 127 mm and 168 mm sizes. Formatt-Hitech glass filters are manufactured from the finest optical glass in the world, Schott Superwite.