Re: SL3D some more

[P3D William Carter <wc@xxxxxxxxxxxxxxxxxxx>]

Peter Davis:
"I don't know if Vivitar understood the principles behind this lens or
not... "

Allan Woods:
"I think excerpts from the patent text are forthcoming."

Jimmy Songer:
     A further object of the invention is to provide a three-dimensional 
photographic system of the above character (discription of the device. 
Ed.) in which the resulting photograph is optically sharp at the focal 
plane, i.e., zero binocular disparity and in which the binocular 
disparity is directly related to the distance from the focus distance of 
the lens, and in some applications the disparity can also be made 
proportional to the defocus blur normally associated with an unfocused 
image, i.e., the stereo information is carried in the blur normally 
associated with out-of-focus region of operation of the lens.
     Another object of the invention is to provide a three-dimensional 
photographic system of the above character which is free of keystone 
effects and which utilizes a multiple path technique having identical 
path lengths so that distortion produced by pathlength differences is 
eliminated and therefore is particularly adapted for use in micro and 
macro photographic applications.
    Another object of the invention is to provide a three-dimensional 
photographic system of the above character which is capable of producing 
a photograph which resembles the same view of object space as would be 
seen by a person having two eyes focused on the focal point of the same 
scene and is therefore free of distinct double images
    Another object of the invention is to provide a three
dimensional photographic system of the above character and particularly 
method and apparatus for producing stereo pictures which is particularly 
convenient and practical to carry out as a modification to existing 
lenses and which involves essentially no auxiliary equipment or 
attachment in most embodiments
  Another object of the invention is to provide three-dimensional 
photographic system and camera ap- paratus which requires no external 
camera attachments and requires no mechanical adJustments to achieve 
stereo photography, and further, which is automatically adjusted 
simultaneously in the act of adjusting focal distance of the camera lens
  Another object of the invention is to provide a three-dimensional 
photographic system of the above character in which the resulting 
photographs are particularly comfortable to view either utilizing 
special glasses for stereo effect or without viewing aids as compatible 
two-dimensional photographs or motion pictures	


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