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This 72mm Blue Enhancer (Intensifier) Filter from Hoya is designed to enhance blue colors of the spectrum. When a circular polarizing filter alone cannot enhance enough of the blue colors, because of a cloudy sky, combine the Blue Enhancer and a Circular Polarizing filter together and it will intensify the colors and increase the contrast of the image.
The Blue Enhancing filter has a filter factor of 2.5, so you should increase your exposure by 1 and 1/3 of a stop to compensate. Transmission of light passes easier through the filter, because of a single type of coating, which has been placed on both sides of the glass; reducing reflections off the surface of the filter. The ring is made of aluminum adding strength and protection to the lens while is it screwed on.
Single coating on both sides of the glass for better light transmission