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- Aug 16, 2019
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- 898
My daughter and SiL gave me a 3 pack of subject filters (FP, ND8, ND16) for my birthday. I haven't tried any of them yet, but paperwork included in the package mentions a free app from PolarPro. There are a lot of negative reviews on the PlayStore, but many more positives. I've read a bit in the forums and watched some YouTube stuff on filter usage, but was wondering if anyone has used the app and if it is worthwhile.