Long Exposure Photography with the K&F Concept Variable ND Filter

I'm testing out a variable ND filter from K&F Concept this week with some long exposure waterfall photography. I take the filter to Folly Dolly Falls in Meltham to try out all all 9 stops from ND2 all the way up to ND400.
Link to the filter on K&F Concept's website: bit.ly/2TQHnEo
Amazon Primeday link: www.amazon.co....