The Formatt Graduated Reverse Neutral Density (ND) 0.6 4 x 5.65" filter is a unique filter that allows you to photograph sunrises and sunsets while retaining details in the foreground. Traditional graduated neutral density filters filter from the top of the filter downwards and allow you to balance a bright, contrasty sky with a dark foreground. However, this innovative filter works in the opposite way. The transition starts in the middle and moves upwards, allowing you to control the light where it is brightest (at the horizon) while retaining foreground details.nnFormatt, a company with three generations of experience in manufacturing professional filters, produces each filter to the highest technical standards. The best materials, combined with cutting-edge production technology, have achieved a level of optical excellence unmatched elsewhere.nnNeutral density filters have four main uses:nn- Allow the use of slow shutter speeds, especially with high ISOs, to record the movement of subjects such as waterfalls, clouds or carsnn- Decrease depth of field by allowing the use of larger apertures, which helps separate subjects from their backgroundnn- Reduce the effective ISO of high-sensitivity films (above 400 ISO) and allow their use outdoors in bright situationsnn- Allow cinema and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes that could cause overexposure