Hmc hoya multi coated the hoya hmc 81a filter is used to decrease the colour temperature slightly for a warmer redder tone by using a light balancing filter the popular hmc hoya multi coated filters are renowned for reducing flare and ghosting as they have the ability to minimise reflection at the filter surfaces the result shows an average light transmission of over 97 which gives sharp contrast and well balanced colour for enhancing the performance of todays multicoat