The Hoya Enhancing filter is a combination of rare earth elements(didymium)in glass. It removes a portion of the spectrum in the orange region, increasing the color saturation of reddish objects by eliminating the muddy tones and maximizing the red hues with minimal effect on other colors.
Its most frequent use is for obtaining strongly saturated photographs of fall foliage
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+1 stop (approximately)
Increases saturation in earth tones; Makes reds, rusts and oranges "pop" with minimal effect on other colors
Architecture, woodwork, rock formations, old barns - To achieve more vibrant and saturated colors of foliage in Autumn