Here are some great explanations how this works.
.5 second at f/9. This is my favorite one.
One of the great creative joys of photography is learning to blur running water. This kind of photo never gets old and is always visually appealing because you never actually see it, in real time. In this case, the camera can see the world at a much slower speed than our eyes. Here’s how to do it.
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VANERPADDEL 
Naah … I MUCH prefer your own 1/400th of a second – that’s AWESOME !
🙂 Thanks.
Beautiful – Thanks Stefan
Blessings – Anne
I love those long exposures!! Beautiful!