Tiffen 138mm Combination Enhancing/Ultra Circular Polarizing Filter

The Tiffen Enhancing/Ultra Circular Polarizing Glass Filter  is a wonderful filter designed to bring significantly more "snap" to your images.

Ultra Polarizer
If a traditional polarizer doesn't give you enough "zip", the "Ultra" polarizer gives you a little more. It will bump up your blue skies even more - making the difference between a good photo and a great image.