I have never had a ND filter before. But now I have bought a ND64 filter, because I have seen all these amazing landscape and seascape images, made with the use of various ND filters of different strength. So now I wanted to try that also.
The above image from a forest/lake not far from where I live, is made with the ND64, camera set on ISO 100, F22 and the exposure time was 25 sec.
The stream looks very different from an ordinary image where the stream would have been frozen. I like this way to show movement in still photography.
The image was postprocessed to my taste in Affinity Photo.