Hi Lon
I’m new to the forum but not photography so I thought I could chip in on NDs
Your aperture value works independently of any ND you add. So ND4 at f4 will be f4 minus 2stops, ND4 at f5.6 it will be f5.6 minus 2stops etc.
Easiest way to think of it for me is that ND applies a base line...
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