Re: M.J. Diness - stereography

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

John Barnier asks about old stereophotography methods.  

I don't know much about it but I do know that twin-lensed cameras came 
almost as early as single-lensed cameras so although your subject may have 
taken stereo by shifting the camera, he could have used a twin-lensed 
camera if he'd purchased one.  I don't know how the shutters were synched 
on twin-lensed cameras but if they were somehow cruder than today's, that 
could explain the movement between left and right exposures.  I'm 
interested in your comments on visiting card cameras.  I imagine they were 
along the lines of today's twin-lensed passport cameras which have lenses 
too close together for normal stereobase pairs.  But six lenses in one 
camera!  Wow!  Tell me more.

I think one thing you night try is contacting the University of California 
at Riverside.   Their antique stereocard site is 
http://cmp1.ucr.edu/exhibitions/km_collection_id.html

John B


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