Hoya 67mm Variable Density 3-400 Filter
TheHoya 67mm Variable Density Filterusestwo polarizing layersto control the amount of light that passes through the filter and into the camera lens. At its minimum effect, the filter passes1/3 of the lightin a scene. That is equal to1.5 stopson the aperture or shutter speed. At its maximum effect, the filter passes just1/400 of the lightin a scene. That isequal to 9 stopson the aperture or shutter speed. After the filter is mounted on the lens, turning the filter ring between"Min"and"Max"can greatly control the amount of light entering the lens.With the Hoya Variable Density filter it is possible toshoot with fast lenseslike a 50mm f/1.4 lens wide open in full sun for avery shallow depth of field. Or, toslow down the shutter speedto where the shutter can be open forseveral seconds in full sunlight. This is enough to create artistic blurring shots of motion on water, cars, people or almost anything that moves. The creative possibilities are endless.Key Features:• Use larger aperture settings in bright light, permitting a shallow depth of field and beautiful background blur• Will not effect the color or detail of a scene• Eliminates overexposed & washed out images• Variable range: 3-400