Jamdiver:Exactly eric, you want the shutter open long enough to capture the 'flowing movement' of the water.
If you look at your pics i'm sure you see the difference in the 1/1000s speed shots in which the water droplets are frozen.
And the 1/60s shots were the water starts to look a bit silky.
I could never get the shutter to stay open long enough in my point and shoot because the maximum was fstop was 8, so too much light was coming in for the shutter speed that I would need.
Like in mine (canon PS A-75).
So for 1.6 seconds, you needed a f25 (it's 25 not 2.5 right? ) in order not to have too much light is that it?