The Hoya 72mm - 80A Hoya Multi-Coated (HMC) Glass filter is blue. It is used to balance daylight film under artificial, tungsten or standard (household) incandescent lighting. This filter allows you to "balance", i.e. bring back, correct color tone to your images. There is some loss of film speed that may require the use of a tripod but, at least, your photos will demonstrate the proper tonality they so richly deserve. These are color conversion filters for the use of daylight type color films with artificial light source.
The advantage of Hoya filters is that Hoya puts one layer of anti-reflective coating on each side of their glass. It is not bare glass. Even if the glass is not multi-coated, this kind of production tends to minimize flare and ghosting. As one of the premier filter manufacturers Hoya filters continue to made from quality glass assuring the photographer clear, sharp and accurate images Hoya filters consistently provide even color all the way through the filter; all surfaces are ground and polished to specific thickness and tolerances Even non-multi-coated Hoya filters have one layer of anti-reflective coating applied to each surface of the glass; Hoya's single layer coating decreases light reflection off the surface from approx. 9% to an average of 4-5%
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