Hoya 72mm Blue Intensifier Filter**

The Hoya 72mm Blue Intensifier Filter intensifies and enhances colors in the Blue region of the spectrum without adversely affecting other colors. It is particularly useful for brightening seascapes and partial or cloudy skies, but also suitable for when, due to the sun’s direction, polarizing filters are ineffective in increasing the saturation of a blue sky. For increased contract Hoya recommends using the Blue Enhancer with a circular polarizer filter.