The Tiffen Series 9 Combination Enhancing and Circular Ultra Polarizing Filter is a combination of two wonderful filters designed to bring significantly more "snap" to your images. If a traditional polarizer doesn't give you enough "zip", the "Ultra" polarizer gives you a little more. And, while the polarizer will boost the blue end of the image, the Enhancing half of the filter gives the red end of the spectrum a real jolt.
Enhancers remove 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. Anyone who has ever shot Autumn foliage will know the value of an Enhancer.
Note! Circular polarizers are specifically designed for use with auto-focus SLR cameras (They will also work on manual systems and video cameras without problems)