kloner
Aerial DP
I've used polar pro filters for a while now, when i went to get some for my hero3 i was stoked to see they are making complete filter sets in ND and polarized in glass. not only that, there offering a version for naked heros which turns it into a layer lens as well, nice clear one. I grabbed that 3 piece set while it's on sale, When it gets here i'll make some vids showing them in use. it has a 3 stop ND, 4 stop ND and a polarizer for water
http://www.polarprofilters.com/
http://www.polarprofilters.com/