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Hoya 58mm Variable Density Screw-in FilterThe Hoya Variable Neutral Density (ND) Filter (0.45-2.7ND) uses two polarizing layers to control the amount of light that passes through the filter and into the camera lens. At its minimum effect the filter passes 1/3 of the light in a scene. That is equal to 1.5 stops on the aperture or shutter speed. At i..