Long Exposure Stacker?is a tool for combining images to blur motion and to reduce noise. It can be used to simulate very long exposures to remove the appearance of waves from the surface of water or soften the motion in water falls and clouds.?Long Exposure Stacker?is an alternative to using dense neutral density filters, such as 6- or 10-stop ND filters, at capture time. Because the images are combined, the noise in the final image is reduced. This means that split neutral-density filters may not need to be used in the field. Instead, burning, dogging and gradient filters can be used in an image editor, without the risk of exposing noise.