Cameras cannot expose for all the detail of extremely bright and dark scenes (dynamic range) at the same time so we use Graduated Neutral Density Filters (GND) to help our cameras balance the exposure between the bright and dark part of our scene. GND Filters are typically distinguished by the type of transition that exists between the transparent and dark areas of the filter. For this reason we can identify four families of GND's.
NiSi Soft GND
NiSi Hard GND
NiSi Reverse GND
NiSi Medium GND
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SOFT GND FILTER
Soft GND Filter are characterised by a soft transition (they change from light to dark more gradually) and are therefore used when the transition between light and dark areas is not so clear. A classic example is a shot in a mountainous area.
Available Size : 75x100mm | 100x100mm | 150x170mm | 180x210mm
Density : 0.6 | 0.9 | 1.2
MEDIUM GND FILTER
Medium 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. It is particularly useful for images that feature buildings, mountains and other small elements that protrude into the skyline.
Available Size : 75x100mm | 100x150mm | 150x170mm
Density : 0.6 | 0.9 | 1.2
HARD GND FILTER
Hard GND Filter, which are characterized by a clear boundary (it’s obvious where one begins and the other ends) between the transparent and dark areas. They are therefore used when the separation between the bright and dark areas of your scene is very defined, such as the horizon at sea.
Available Size : 75x100mm | 100x100mm | 150x170mm | 180x210mm
Density : 0.6 | 0.9
REVERSE GND FILTER
Reverse GND Filter, which are nothing more than hard-edge GNDs with the dark area that fades away the more you move from the line of separation to the upper border of the filter. Basically, they were invented to better manage sunrises and sunsets, where the light is more intense on the horizon line (middle).
Available Size : 75x100mm | 100x100mm | 150x170mm | 180x210mm
Density : 0.6 0.9 1.2