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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 632428" data-attributes="member: 13090">The "ND" designation is confusing. I would say the most common ND filters are the ND8 (three-stop reduction) and the ND1000 (ten stop-reduction). Others, such as the ND16 (four-stop reduction), ND32 (five-stop reduction) ND64 (six-stop reduction) et al. are out there but can be harder to find in my experience. I find the ND8 most useful, personally, but use an ND1000 for the "silky waterfall" shots. The trouble with the denser filters is that you can lose the ability to auto-focus through the filter, so you have to focus and then screw on the filter just prior to taking the shot.</blockquote>