Interesting theme and one that requires a bit of thought as to what fits. I am going for a wide net with this one.
When we shoot waterfalls a long shutter open offers up a result we can't actually see with our naked eyes. This is a long exposure looking at the base of Latourell Falls in the Columbia River Gorge:
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We can feel cold but we can't really see it. At the same time we can see the results of it in this case at Multnomah Falls with this icy scene:
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Wind on the open waters of the Pacific doesn't leave something like a sand dune but it can whips up big swells that give us a nice show when they reach the shore. This scene is from Shore Acres State Park with some big swells sending the surf 30-40' into the air:
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Another way to shoot what we can't see is to resort to shooting ranges of light not visible to the naked eye - Infrared in this case with a shot taken by a converted camera with a filter for 720nm light waves. Also at Shore Acres. This would have been a really bad place to shoot from with the waves in the image above.
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Another round of wind but this time during a moderately nasty storm at Harris Beach State Park along the souther Oregon coast.
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