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Message: <blockquote data-quote="hark" data-source="post: 387086" data-attributes="member: 13196">It will go from 1-stop to 9-stops. As Jake mentioned, the problem some people have experienced is that the variable ND filters aren't good when it comes to the higher stops. It adversely affects the image. It should work for between 1 stop and hopefully up to 6 stops, but above that you will be taking a chance. I think it might have been Rick M who once mentioned he used a 3-stop ND filter but the effect wasn't quite enough for what he wanted. If you want the glassy smooth and/or silky water effect, you should look for either a 9- or 10-stop ND filter. The ND400 is a 9-stop filter.</blockquote>