Tiffen 67mm 1.2x (4 Stop) Solid Neutral Density Filter, ColorCore Technology Tiffen 67mm 1.2 (4 Stop) Neutral Density Filter - Tiffen 10 Year Limited Warranty 1.2 neutral density filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required Providing a 4 stop exposure reduction, this filter allows you to control depth of field and convey movement more easily Filter does not affect coloration of the image and is ideal for use with other filters