Thanks for the link, I was not aware of that! However, if they actually intended to produce filters for the Phantom, why didn't they just put threads on the lens from the beginning? Looks to me like an afterthought.
Hi Renaat, a good idea for your next project could be a way to mount ND filters on the Phantom 3, perhaps a push-fit collar with threads to accept the filters. This would sell like hotcakes once Phantom pilots discovered them!
Dimitris