Kenko 52mm RealPro MC ND1000 Filter

Neutral Density filters are the most commonly used along with C-PL and UV filters. These filters, instead of the ones that protect the lens from damage or UV pollution, were created to decrease the volume of the light entering the lens. True ND filters decrease light equally to achieve the same density through the all-visual spectrum giving no changes in color balance of the image. That is why the called Neutral Density.