No Subject

[P3D allan carrano <allan.carrano@xxxxxxxxxxxxx>]

     I thought I understood the placement of stereo windows.  Then I read 
     recent posts (Wageman, Harrington,et.al.), and now I'm confused.
     
     I found myself initially understanding and agreeing with Greg 
     Wageman's assessment:
     
     >If I understand it right, the offset lenses simply cause the left 
     >image to have more information from the right side of the scene, and 
     >the right image from the left side of the scene.  This binocular 
     >disparity of the left and right sides of the window border causes the 
     >window to have an apparent location in the scene closer than 
     >infinity.  
     
     This relates to the reality of looking through a real window.  Stand 
     in front of one in your home.  Close one eye and look.  Then close the 
     other eye and look.  The right eye saw more of the left side of what 
     was out the window and visa versa for the left eye.
     
     Then Neil Harrington says:
     
     >...As long as the frame apertures are spaced slightly farther apart 
     >than the lenses, the camera will have slightly converging angles of 
     >view (taking each view as a whole) while the lens axes remain 
     >parallel.   
     
     I would have thought the frame apertures would be spaced slightly 
     closer than the lenses, so the left eye (lens) would see more of 
     what's on the right and the right eye (lens would see more of what's 
     on the left, as with the real world "window reality check" described 
     above.
     
     I even looked up John Bercovitz's web reference for the diagram of the 
     apertures separation relative to the lenses, and sure enough the 
     apertures are shown to be farther apart.  
     
     Am I interpreting lens and frame apertures incorrectly?
     
     What am I missing? 
     


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