Neutral Density filters are extremely useful in video and still photography applications when you want to control light and use lower shutter speeds.
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Typically in video you will get the best motion estimation by using a 180 degree shutter. This is double the frame-rate of your video clip. In still photography and landscapes you want to be able to capture motion of things like clouds or water for a dramatic effect.
All ND filters are not created equal. Color casts are a huge problem as are distortions from glass inconsistencies. I use only Blackstone filters for this reason.
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