Smooth Water

 The usual way to make "soft water" is of course to use a neutral density (ND) filter in front of the lens to make exposure long enough so the water current soften out. However, it is not possible to attach a filter to all lenses (Fisheye or other wide angel lenses) due to big, curved front elements.  Another method is to stack several photos together using software. In the end the result is more or less similar. This picure is a stack of 25 photos shot in the middle of the day.

Leica M9 with Voigtlander 15mm