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Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
The sand is damp and lets the arc start. The thin ones are very brittle but the longer I let it arc the thicker they get. The thickest one I have is about 1cm thick and a lot stronger.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
The motion behind it seems fairly simple, an LED spinning around a point and that point is spinning around some other point. But I can't imagine how you achieved that motion with a simple rig.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Correct. My wife had a battery operated LED light that she got to provide a light over the BBQ. It has 24 LED's in a circle. I simply suspended it with a bit of fishing line from the rafters (not really a complicated rig!). Give it a spin then set it rotating in a circle or ellipse and take a time exposure. The exposure needs to be set for just over one period of swing and I used 2 seconds. It's very bright so the f stop was set back as far as possible (f/22). It all took about 10 mins from conception to get the first shot .
In the photo below I have covered one of the lights with blue cellophane and you can see the course of the individual LED. Add a bit of tilt causing gyroscopic precession and the pattern becomes complex.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
6 hours ago I would have had no idea what this was. This is my second attempt and I will do a proper post on it once I get it all tidy. The output spark is 5mm.
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Mystery Photos from TDU
