The Tiffen 107mm Coarse Thread 0.9 Neutral Density Filter is a solid ND filter with an 8x filter factor that provides a 3-stop exposure reduction. nnIts density of 0.9 creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. nBy slowing down your exposure time or increasing your aperture, you can more easily control depth of field and convey motion. nNeutral density filters do not affect the colouration of the image and are ideal for pairing with other filters.nnThis filter is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding it flat to a tolerance of 1/10,000th of an inch, then mounting it in precision metal rings.nnThe 0.9 neutral density filter darkens the image, allowing you to photograph with a slower shutter speed or wider aperture than normally required.nProviding a 3-stop exposure reduction, this filter allows you to more easily control depth of field and convey motion.nThe filter does not affect the colouration of the image and is ideal for use with other filters.nThe filter's 107mm front thread allows use with other filters.nPlastic case for storage and transport.nnTen-year warranty