Neutral Density filters are extremely useful in video and still photography applications when you want to control light and use lower shutter speeds.
Check out Blackstone filters at http://www.winecountry.camera/
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Typically in video you will get the best motion estimation by using a 180 degree shutter. This is double the frame-rate of your video clip. In still photography and landscapes you want to be able to capture motion of things like clouds or water for a dramatic effect.
All ND filters are not created equal. Color casts are a huge problem as are distortions from glass inconsistencies. I use only Blackstone filters for this reason.
Check out my other videos:
• Wine Country filter system https://www.youtube.com/watch?v=4FUnWbmTDKU
• Photographing the Grand Canyon https://www.youtube.com/watch?v=i1jw7vlGGXE
• $63,000 camera https://www.youtube.com/watch?v=Pq2LmstGD5M
• Most expensive camera money can buy https://www.youtube.com/watch?v=PSZ8fIKVkm0
Music is from Epidemic Sound. If you need music for your videos, Epidemic is simply the best in the business. Check them out here: https://goo.gl/v5wWKr