Tiffen 6.6x6.6" Neutral Density 2.1 Filter

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. The higher the number of the density filter the stronger the effect .