So in my next visit to MidWest Camera I learned about a variable neutral density filter--variable in that it began with 2 stops darker and by clicks went down to 8 stops darker. Genius was the name of the filter. Expensive. But I went back and here is a 3 minute exposure of the duck weed.
I thought I'd be clever and use the variable neutral density filter at High Banks in the Fall and see what occurred.
Blur occurred. or.... BBBBBBBBBLLLLLLLLLLLLLLLLUUUUUUUUUUUUUUUURRRRRRRRRRRRR
So I went to focus stacking. I created 32 images rapidly. And then put them together. Not as fascinating as the swirl in the pond, from a tiny trickle of water.....
Swirls like galaxies are found in all kinds of places on the crust of the Earth, in clouds, in sandstone--the record of the swirls from millions of years ago.
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Next time, the question is, How do you put 32 images together as one? Or, What is focus stacking? Or, How to make a curving fern that is in focus at one end but not the other, in focus from end to end?