The B&W 48mm Enhancing Glass Filter is an absolute necessity for those who enjoy the Autumn foliage or any venue where you wish the earth tones to be exaggerated. This filter gives the red end of the spectrum a "boost" creating colors that are more vivid, saturated and surreal.
It 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.