P3D Re: tilting method of stereo

[john bercovitz <bercov@xxxxxxxxxxx>]

John B:
>> We have a guy who does
>> tilts on his rock specimens.  Some of them are human-head size.  Of course
>> we don't know what the rock looked like in the first place.  A tilt causes
>> bulging.  See Ferwerda or Woods' page http://info.curtin.edu.au/~iwoodsa/
>> leading to http://info.curtin.edu.au/~iwoodsa/spie93pa.html
Larry B:
> Are you saying you can do SEMs with large objects? I wasn't aware that
> the machines accepted more than miniature objects.

Apologies, I wasn't clear (again) - Barrie puts his rocks on a tilting board.
He uses around 6 degress.  We can't see any bulging because we are not
on an intimate basis with his collection.  8-)  So these pairs look great.
He doesn't use an extremely long focal length like SEM does to give an
infinite perspective.  So if we _did_ know his rocks well, we'd see the 
bulging.

John B


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