To capture moving water with a silky smooth look, a long enough shutter speed would do the job nicely. I could use a neutral density (ND) filter or set a low ISO to slow down the shutter speed.
But I loath to pay a premium for a good IRND filter, although such would be coated to block infrared and ultraviolet light and deliver images free of colour cast. Some day perhaps I may just get around to it if water photography becomes a bigger part of my portfolio.
Instead, I had used ISO 50 to get a 1/8-second shutter speed here. Maybe this wasn’t really that long but it was apparently enough to create smooth flowing water. After a couple of hastily composed shots though, we had to run for cover as it was starting to rain.
Helluva Times 