Igor PDML-StR wrote:
The idea for this puzzle came while I was working on some recent photos... I think this puzzle is rather simple. (And there is some interesting physics in it.) What is this: http://42graphy.org/misc/puzzle-2015-06-29/_IR26728-3.jpg ?
It's a time exposure of some sort of moving particles. I don't know whether the length of the path has to do with difference in speed, or direction. I.e. traveling normal to the axis of the lens would be a longer path than along the axis.
I would guess that the particles are lit, but shot against a black background.
Engrave your answer on the outside of the barrel of DA 15mm f/4 Ltd lens, and send it to me. :-) Igor
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