My best guess is that the artificial lighting is to blame, and those contours coinside with the frequency of the alternating current. However, the frequency is 50Hz in North America, so at 1/15s I sould catch 3.3 periods. Since each period has two vertices, then there should be, at most, 6 contours replicated, but I am seeing 8.
If you ever fiture out what you did, please write a tutorial. I'd love to be able to do that with the lines.
It also amazes me how you managed to get just the guy in the bicycle in focus and everything else, even the other cyclist, is about equally out of focus. Great stuff.
Not so sure about this but, it is 60Hz not 50 Hz. in NA, that would give you 3.99 periods and assuming the light lit twice every cycle, 1+, 1-, that would be 8. Again, I am pulling this out of my ...
Anyway this is a very cool pic and the panning is very good.
It would be 6 assuming that you caught it at the center of a cycle. If you started with a vertice and ended with a vertice, you would have 8 (2 ends plus the 6 in the middle).
I thougt about that. Suppose I caught one right at the opening of the shutter (time 0). Then there will be 3.3 more periods left to go. Since we have a peak each half period, so we have at most 6 more peaks to go. So, we should be getting at most 7 contours. I guess this is close enough for the explanation. Unless there is another explanation for the phenomenon.
It would be 6 assuming that you caught it at the center of a cycle. If you started with a vertice and ended with a vertice, you would have 8 (2 ends plus the 6 in the middle).
That's how my logic goes anyway, and I'm out of my league with this topic. Becky
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