xcsource 55mm ND2 ND4 ND8 Neutral Density Filter Set for Sony Alpha DSLR A99 A77 A65 A57 A37 A290 A380 A390 A550 A560 A580 A100 A200 A300 A350 LF61 Introduction Neutral Density filter evenly reduce the amount of light passing thru the lens without effecting color Ideal for reducing bright light in large aperture situations when a narrow depth is field is needed Allows for slower shutter speeds when blurring or showing of movement is desired Allows balancing of exposure to highlight a key subject Lets you use higher speed films in bright light