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Message: <blockquote data-quote="Whiskeyman" data-source="post: 248335" data-attributes="member: 13556">In addition, you can get a series of ND filters that stack on each other to give multiple ND strength options.  For instance, stacking a 2-stop, a 3-stop and a 5-stop ND filter on top of one-another will give you a total of 10 stops of light loss.  That combination allows you to have the capability to also filter to 2, 3, 5, 7 and 8 stops of light, instead of just 10 if you were to buy a single 10 stop filter.  There would be some additional image degradation due to adding additional layers of glass in the light path.  But it is something to think about.WM</blockquote>