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Message: <blockquote data-quote="hark" data-source="post: 533615" data-attributes="member: 13196">A Neutral Density filter will allow you to shoot with longer shutter speeds. If you've seen photos where waves crashing against the shore look as smooth as glass, or where clouds appear to make smooth streaks in the sky, they are examples that can be accomplished with the use of an ND filter. There are different strengths of ND filters. Common ones are 3-stop (ND-8), 6-stop (ND-64), 9-stop (ND-500), and 10-stop (ND-1000). The higher ones such as 9 or 10-stop work very well. 3-stop ND filters don't always allow a slow enough shutter speed although the higher stop filters tend to be more expensive.</blockquote>