The 4 x 5.65" Tiffen Night Fog Camera Filter yields a natural fog effect with overall atmospheric softening and wide flare, coupled with unique contrast reduction technology that reduces highlights without darkening shadows. This filter has an effect grade of 2. This filter has been manufactured using the Colorcore Technology process that laminates the filter substrate between two pieces of optical glass, then grinds and polishes them to a precise tolerance of 1/10,000" flatness. Made in the USA, the filter has a 10-year Warranty.