The Tiffen Double Fog 1/4 4 x 5.65" Filter simulates the effects of natural fog or mist by creating a soft halo around highlights and reducing the overall contrast of the scene. Compared to the standard Fog filter, this filter places greater emphasis on reducing contrast whilst maintaining sharpness and minimising flare effects. The 1/4 density provides more fog effect than the 1/8, but less than the 1/2, and requires no exposure compensation.nnTiffen filters are made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding it flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 5.65" / 101.6 x 143.5 mm.nnn- Provides a fog effect with significantly reduced overall contrast.n- Maintains greater sharpness and is less affected by highlight flare than the standard Fog filter.n- Requires no exposure compensation to account for the filter effect.nnnSpecificationsnn