RE: Moon...

[P3D Shelley, Dan <dshelley@xxxxxxxx>]

I did a search of the old archives and found the following: (Note, 
there is a TON more about this out there to be seen from the last time 
this subject was brought up on the list... http://bobcat.etsu.edu)

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Stereo photographs of the moon are true stereos. (Note: flame bait.) 
The effect of a  baseline thousands of miles long is provided by the 
moon's libration. The moon does not present exactly the same 'face' to 
the earth over the months. It wobbles or swivels slightly on its axis, 
a very complicated motion whose greatest extent is side to side. The 
moon was a popular subject for stereophotography in the Nineteenth 
century. The first known lunar stereo was taken by Warren de la Rue in 
England in 1858. The solar eclipse of August, 1869,  was photographed 
stereoscopically, but likely was a flat pair. Keystone produced about 
30 astronomical views, most are scarce, but 8 are from its common 
larger sets. The moon was  the only true stereo, photos of Mars, 
Saturn, Uranus, and meteors were quite flat. The view of the sun is 
also flat, but the potential for some stereo effect is there, since the 
sun rotates. However, the lack of features on its surface, other than a 
few sunspots, makes it hard to get a stereo effect. A very beautiful 
Keystone stereo (#600) is of Moorhouse's comet of 1907, I believe.) 
This has a false stereo effect, provided by the motion of the comet 
across the sky in the day or days between res. There will be a 
wonderful opportunity for stereo photographers to try their luck at 
this type of picture in about a year, when comet Hale-Bopp is at its 
brightest. It is predicted to be very bright, and an easy object for a  
telephoto lens. See Stereo World, 11/12 1985, for an article on how to 
photograph Halley's Comet. It is very unlikely that Hale-Bopp will be 
as dim an object as Halley was on its last go-round. On libration: a 
stereo photographer could get a true stereo portrait by asking the 
subject to turn slightly left the right. However, the background would 
not be shifted. Would the photo look unusual or less Stereoscopic? 
Addenda?--Assessments???--Replies??? 
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I also went looking for stereo pics of the moon based on an old message 
I found while looking, and found stereo pairs from 3 Apollo missions: 
"Stereoscopic Close-up Surface - To obtain information about in-place 
lunar rocks and soil, a close-up stereoscopic camera capable of 
photographing small-scale surface features was used..." yatta, yatta...

(NOTE: The pages are packed with graphics, and the stereo stuff is at 
the bottom so look at the pages with graphics turned off, and just look 
at the stereo stuff. MUCH FASTER!!)

http://cass.jsc.nasa.gov/expmoon/Apollo11/A11_Photography.html#STEROSUR
http://cass.jsc.nasa.gov/expmoon/Apollo12/A12_Photography_surface.html#S
TEROSUR
http://cass.jsc.nasa.gov/expmoon/Apollo14/A14_Photography_surface.html#S
TEROSUR

The thumbnails are small pairs that can be free-viewed, and the larger 
images they link to are anaglyphs. Quite nice!!

Dan Shelley
Colorado Springs, CO USA
http://www.dddesign.com/3dbydan


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