Product DescriptionNeutral Density 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. Tiffen filters are manufactured using ColorCore technology, a closely guarded proprietary process that entails permanently laminating the filter material in between two pieces of optical glass that are ground flat to tolerances of a ten-thousandth of an inch, then mounting them in precision metal rings.Amazon.comThe Canon 72 millimeter neutral density .3 filter reduces the amount of light passing through the camera lens without changing the color of the scene. This filter is particularly useful in bright light conditions as it helps prevent overexposure. The Canon 72 millimeter neutral density .3 filter also allows proper exposure at a wider lens opening for reduced depth-of-field, thus highlighting the subject by making the foreground and/or background appear out of focus. Essentially, this filter allows you to keep "light pollution" to a minimum. Your images from the beach or anywhere outdoors in the bright sunshine will never be washed out with the Canon 72 millimeter neutral fensity .3 gilter. Colors will be crisp, exposure will be balanced, and what you visualize in your camera will be realized in your prints.