The 85 amber (warming) series of filters filter is used for exposing tungsten materials in daylight. They decrease colour temperature thereby producing a warming effect and reducing blue casts. The 85 filter reduces colour temperature from 5500k to 3800k. This 67mm filter is usable with Hitech 67mm holder systems or any 67mm (2.67″) holder. The filter is also available in 85mm, 100mm, 150mm and 165mm sizes. Hitech filters are made from the highest quality 1.5mm optical resin.