Just got this set in from Amazon: Amazon.com: Neewer for DJI Phantom 4, DJI Phantom 3 Professional and Advanced, Multi-Coated PL-ND Filter Set: PL-ND4, PL-ND8, PL-ND16, PL-ND32, Made of High Definition Glass, Not for DJI Phantom 3 Standard: Camera & Photo for $50 and 2 day shipping from Prime...