Thanks Andrew. I didn't take any shots without the filter, but I imagine the shots would be much brighter, especially if I used the same exposure.
From the ebay product:
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This dark Neutral Density can reduce 2.5 stops, for example if your meter reads 1/8000 second, this filter can reduce it to 1/1500 second. It is very useful for today's light sensitive digital camera when you want wide open aperture to achieve shallow depth of field or slow shutter speed to achieve blur effect
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It allowed me to take a longer exposure to get the water blurring without overexposing.
With my old digicam (which had limited f/stops) I could only do a couple of seconds before it was overexposed.