These filters reduce the amount of light passing through the camera lens without changing the colour 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 aperture for reduced depth-of-field to highlight a key subject by making the foreground and/or background out of focus.
Eliminates overly bright, washed-out images
Allows slower shutter speeds to produce blurred motion effects