Hoya R64BLUEENHANCER77 Blue Intensifier Filter - 77mmEnhance Blue Tones in Your Photography The Hoya R64 Blue Enhancer Filter is designed to intensify and enhance blue colors in your photographs without affecting other colors. This filter is particularly useful for landscapes, cloudy skies, and situations where polarizing filters are not ideal for increasing blue saturation. It can also be combined with a circular polarizing filter for enhanced effects. Type: Blue Enhancer Filter Size: 77mm