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I've tried both ways and am fond of the effect of the medium shutter speed, you get just a little splash detail but still get the moving water sensation. I like all of the effects but this one really surprised me.Excellent waterfall shots and you got a critter too!
I looked back and forth, and really couldn't decide on which one I like best, they're all great shots! I noticed you used a higher shutter speed, and it did a good job stopping the motion of the cascading water.
Here's something you can try next time you're at the waterfalls: A friend of mine likes to set the shutter a little bit slower on some shots, so as to "feather" the white water. Expiriment and see what you come up with!
Outstanding job, though!
Aaron, you need to go to some of the civil war battlefields and take some shots for us!