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I Thin a CPL and a ND about cover it, if you don't mind layering multiple exposures.
I just ordered Formatt 5.65x5.65 filters for the 17T&S; a CPL and a 1.8 ND (aka 6 stops, aka 64x) Hope that that was a good choice because, well, $'s. As I recall from a few waterfall shoots, 1.8 is pretty good for misting water, and can work with a CPL stacked for 7 or so stops. I can work out the holder. I've already taken a Lee 82mm WA adapter and trimmed the inside to fit onto the lens flanges that engage the lens cap of the 17T&S. Now I can mount that ring on the lens, and then clip on the Lee holder. Now all I have to do is add width to the Lee holder and add standoffs to hold the filter(s) forward of the HAL9000 eye.