The NiSi P1 Prosories Soft GND is part of our P1 range for mobile phones and compact camera systems including the X100, RX100, and GR3 holders. It features the NiSi Optical Nano Coating, a Double-Sided And Multi-Layer Coating that provides a Waterproof and Oil Resistant Coating. The filter is made from Optical Glass and features the same performance as our large square filter systems. The NiSi Soft GND Filter is a rectangular filter that helps to darken specific areas of an image, such as bright skies while allowing for a normal, unaffected exposure in the other regions of the image. The Soft GND is designed to be moved up and down to control these bright areas. A neutral density filter with a soft-edged line of transition is particularly useful for images that feature trees, buildings, mountains, and other elements that protrude into high into the skyline.