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Message: <blockquote data-quote="Kodiak" data-source="post: 171054" data-attributes="member: 15426">Hi there!The ND (neutral Density) filters come in two shapes: circular or rectangular.The circular will apply an equal amount of density to the whole picture. They are  used to cut off the light in a scene in given situations, ore (ND8) or not so much (ND4). An example is a scene where some elements are in motion like a river, a merry-go-round, etc. Without, if the light is very strong and your shutter speed pretty high, all the scene will be "frozen" in the frame. This may be a desirable take but there is an other option. With. If one reduces the amount of available light, then the shutter will be adjusted to a slower speed to assure correct exposition, thus allowing more time for any actual movement to be recorded. More density applied = more movement recorded. In the case of a river: the banks will be sharp and the water blurry, flowing. In the case of the merry-go-round: the whole scene will be sharp except those on board! The rectangular is offering a dual density (typically 0/2, 0/4, 0/10, etc) that may be turned on the filter holder and aligned /applied to the scene area you want affected.The typical example is a sunset/sunrise scene. One will apply the density to the skyso that the take will be better balanced and the "pain-in-the-neck" PP work skipped!How is that for a rough description?Have a good day…</blockquote>