The Tiffen 4.5-inch ultra circular polarising filter is a remarkable filter designed to bring much more "punch" to your images. nnIf a traditional polariser doesn't give you enough "punch", the "Ultra" polariser offers you a little more. It will further enhance your blue skies - making the difference between a good photograph and an exceptional image.nnReflected light rays become polarised. Polarising filters are used to select which light rays enter your lens. They can eliminate unwanted reflections on non-metallic surfaces such as water or glass and also saturate colours, providing better contrast. The effect can be seen through the viewfinder and modified by rotating the filter. The filter factor varies depending on the filter's rotation and its orientation relative to the sun.nnWater-white glass is characterised by high transmission quality. Typically, it transmits 98-99% of light. It also exhibits anti-glare and anti-reflection properties that make it useful in a wide range of applications, including the film industry, shop windows and art displays. The glass is virtually flawless and is becoming increasingly prevalent in digital equipment.nn-Your deep blue sky will become even more "blue"n-A highly efficient designn-Made from water-white glass