OT: Other collecting activities? - Digital Stereo camera

From: John Allain <allain_at_panix.com>
Date: Sun Apr 18 17:54:33 2004

> The white-light holograms sound *seriously* cool,
> I've never seen anything like that.

Every few months I re-try some Google searches
and "Images in Time and Space" is one of them.
According to the news, those images were so good
that they had a problem with museum staff stealing
some of the better ones.

If I can remember/extrapolate the technology of
a white light hologram it involves three exposures taken
in dim Laser light, with ASA 1 film, in a vibration free
environment, and then the three images have to be
reassembled *somehow* by hand.
Sounds like one man-week per picture or thereabouts,
so each might've been worth thousands.

Trouble with finding holograms is that they invented the foil
hologram (see March 1984 National Geographic Cover) that
didn't require laser light to see and that became the more
popular way to produce&sell them, and they look lower
quality, to me anyway.

Don't know if LED lasers (yeah, the $3.00 ones at Wal-Mart <g>)
are any good for holography. I heard that the length of the Laser
device effected average coherence. With LED's being maybe
200x shorter than a neon tube that might be serious. I think that
had to do with the fact that lasers build and then release a standing
wave, where length matters.

John A.
Received on Sun Apr 18 2004 - 17:54:33 BST

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