The Tiffen 0.3 ND Filter is a solid neutral density filter providing a 1 stop exposure. This 0.3 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field & convey movement more easily. Neutral density filters do not affect the coloration of the image & are ideal for pairing with other filters. This filter is made using Color Core technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10, 000th of an inch, & then mounting to precision metal rings.