This is the one I bought.
Neewer for DJI Phantom 3 Standard4-Pack Filter Kit
Amazon review:
Amazon.com: Neewer[emoji768] for DJI Phantom 3 Standard, 37MM Filter Kit: (3)Filters(CPL / ND4 / ND8)+(1)Filter Adapter+(1)Lens Cleaning Pen+(1)Cleaning Cloth, Not for DJI Phantom 3 Professional & Advanced: Camera & Photo
I haven't received it yet but I think I can put any 37mm filter on it with the adapter included. I am going to put ND2-400 on it.
Looked to Neewer filters as well, but shipping to Europe cost a lot...Also got the
Neewer for DJI Phantom 3 Standard4-Pack Filter Kit
$11.62
From eBay, work a treat. Look good as well.
Why do you need ND filter for still photo?Here's another picture with the Ditzco ND filterView attachment 49070