mountain and sky. A soft edge filter is less noticeable than a hard edge. It also has the benefit of making the sky more intense, darkening the sky the closer on the top. Below is a picture of what a hard edge and soft edge filter would look like. Multi-shoots high dynamic range As an alternative to split graduated neutral density filters, some digital cameras offer built-in high-dynamic-range imaging (HDR) which allow the camera to capture and then combine different exposures of the same subject matter when shooting in RAW image format. However, as long as a sufficiently short exposure time is available, it is possible to exactly mimic the effect of a graduated neutral density filter by using two exposures of the same scene one or several stops apart and blending them with a graduated mask in an image editor. This method has the advantage that the shape of the mask can be freely defined in editing. The disadvantage is that it only works with static subjects using a tripod. References External links An effective demonstration picture Optical filters