Tiffen 52mm Neutral Density 0.9 Filter
Reduces the amount of light passing through the camera lens without  changing the color of the scene. This filter is especially useful in bright- light conditions. Allows proper exposure at a wider lens opening for reduced  depth of field to highlight a key subject by making the foreground and/or the  background out of focus. A slower shutter speed can be used to produce blurred  motion effects.