I believe that should work for you okay. I find that it's just a starting off point anyway. After a few test runs, I think you will find the right combination. I usually shoot a lot of my shots using the chart and some a little shorter and longer than the actual chart shows. One thing you will find with a lot of these ND filters is that you'll have to do some white balance adjustments in post processing. They usually leave a distinct pinkish cast, but that's the nature of the beast.
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