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Old Dec 11, 2006, 3:29 PM   #1
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It's not overly sharp, but my camera had a hard time hunting for focus here...



Any ideas?
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Old Dec 11, 2006, 3:48 PM   #2
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I don't know what it is called but I have seen and played with these devices many time expecially in Spencer Gifts. It is a plasma discharge device whose patterns change when you touch the glass sphere. The plasma is attracted to your hands.

This is a really good example of why to use manual focus with macro/closeup shots. The autofocus will seldom do a good job.

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Old Dec 11, 2006, 6:28 PM   #3
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it's a variation on the old Van de Graaf electrostatic generators...
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Old Dec 12, 2006, 12:49 AM   #4
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Wow Calr, you have a good eye for such things!

Yes - it's the center of a "lightning ball" (at least if you google these words you get something similar".

As for manual focus - this thing was overcrowded and I had a somewhat more peaceful moment of maybe 3-4 seconds at a very dim place - so I just fired away hoping the strong contrasts would make AF possible, but it maybe moved to fast or so. Got like 5-6 shots with and without hands attrackting the lightnings... but it's definitely a nice object to experiement with and I'll try to get better pics next time!

Have a nice day!

calr wrote:
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I don't know what it is called but I have seen and played with these devices many time expecially in Spencer Gifts. It is a plasma discharge device whose patterns change when you touch the glass sphere. The plasma is attracted to your hands.

This is a really good example of why to use manual focus with macro/closeup shots. The autofocus will seldom do a good job.

Cal
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