Amazon

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 when reducing 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.

These filters reduce the amount of light passing through the camera lens without changing the color of the scene. They are especially useful in bright light conditions to help prevent overexposure. Neutral Density filters also allow proper exposure at a wider lens opening for reduced depth-of-field to highlight a key subject by making the foreground and/or background out of focus.