I've had my Phantom 4 for about a week now and absolutely loving it, however I'm going to start using it to film some more important footage now and want to make sure it's capturing the best possible quality video. Are ND filters necessary? And if so, how cheap can you get away with buying them? I can't afford the $100 ones that I've seen some websites recommend but everything else is $10 on Amazon and I'm not sure if they're worth it or might actually even make things worse. They seem to get good reviews but then again none of them have more than 8-10 reviews anyway so not a huge sample size. Any help/advice would be much appreciated!