The Formatt-Hitech 95mm HD ND 1.8 filter is a solid neutral density filter offering a 6 f-stop exposure reduction. This 1.8 density darkens the entire image, allowing you to photograph with a wider aperture or longer exposure time than normally required. By slowing down your exposure time or increasing your aperture, you can more easily control depth of field and convey movement. This filter is made from Schott Superwhite glass to maintain high optical clarity and is mounted in a 4mm thick metal filter ring. - ND 1.8 filter darkens the image, allowing you to photograph with a longer exposure time or wider aperture than normally required. - Offering a 6 f-stop exposure reduction, 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.