I haven't used a bean bag. I do sometimes rest the camera against a tree trunk or on a rock. This time I was lazy and over-confident, and I wanted something with just a bit of a longer exposure.
This was a bright sunny day, so even at ISO 100, the longest exposure I could get was around .1 second without filters. I have a polarizer that I can also use as a neutral density filter and I used that to gain a couple stops for some pictures. 5 seconds would have been way over-exposed.
On cloudy days I have taken 1-2 second exposures and get a very smooth effect to the moving water.
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