The Tiffen 5.65 x 5.65" ND 0.6 Filter is a uniform neutral density filter providing an exposure reduction of 2 stops. This 0.6 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 can more easily control depth of field and convey movement. Neutral density filters do not affect the colouration of the image and are ideal for pairing with other filters. This filter is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and polishing it flat to a tolerance of 1/10,000th of an inch. This filter measures 5.65 x 5.65" / 143.5 x 143.5 mm. - The 0.6 uniform ND filter darkens the image, allowing you to photograph with a slower shutter speed or wider aperture than normally required. - Providing an exposure reduction of 2 stops, this filter allows you to more easily control depth of field and convey movement. - The filter does not affect the colouration of the image and is ideal for use with other filters. Specifications