The 81 series of light amber (warming) color temperature conversion filters decrease color temperatures and create a warming effect reducing blue casts. These filters are used for subtle changes in color balance than the 85 series. They are accordingly often known as light balancing rather than conversion filters. The 81a decreases color temperature from 3400k to 3200k. The glass filter is also available in 100x100mm, 144mm, 127mm and 168mm sizes. Formatt-Hitech glass filters are made from the world's highest quality optical glass, Schott Superwite.
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