Hmc hoya multi coated to reduce flare and ghosting the hoya hmc 81a filter is multicoated which minimizes reflection at the filter surfaces when the photographer desires to remove the bluish cast from open shade or just add warmth to the photograph this product is good for general scenics it converts tungsten 3200 k film to 3400 k lighting please note the 81 series of filters creates a feeling of warmth the 82 series creates a feeling of coolness 81 series conversio