The Formatt 6.6 x 6.6" Neutral Density (ND) 0.6 Reverse Graduated filter is a unique filter that allows you to photograph sunrises and sunsets whilst maintaining foreground detail. Traditional graduated neutral density filters graduate from the top to the bottom of the filter and allow you to balance a bright, contrasty sky against a dark foreground. However, this innovative filter works in the opposite way. The transition starts in the middle and graduates upwards, allowing you to control the light where it is brightest (at the horizon) whilst maintaining foreground detail.nnFormatt, a company with three generations of experience in manufacturing professional filters, produces each filter to the highest technical standards. The finest materials, combined with cutting-edge production technology, have resulted in a level of optical excellence unmatched elsewhere.nnnNeutral density filters have four main usesnn- To enable the use of slow shutter speeds, particularly with high ISOs, to record movement in subjects such as waterfalls, clouds or carsnn- To decrease depth of field by allowing the use of wider apertures, which helps to separate subjects from their backgroundnn- To reduce the effective ISO of high-speed films (above 400 ISO) and allow their use outdoors in bright situationsnn- To enable cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes that might cause overexposure