3Discover revisited.

[P3D Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

Grant Campos awhile back (digest 1664) had mentioned using mirrors for
transposing the stereo views on the film so that it could be used with
a RBT 3D camera and 3Discover viewer. His ascii pic looks promising, but
don't know if the extra distance traversed by introducing the mirrors
would effect the distance perspective adversely. Sam had also mentioned
something that was done by someone in Montreal using mirrors. I suppose
it's very probable that a transposing camera was made by the same person
as the 3Discover. 

      fig.1           The left diagram is a condensed version of the ascii
\             \       pic, Grant had made. The sloping diagonals are the 
 \             \      mirrors and the l and r are the lenses on the RBT 
  \   __      __\     camera. This would effectively transpose the pics on
       l       r      the film. For example the left mirror would reflect 
                      the image to the right mirror and on to the right
                      lens.

Another idea that crossed my mind, after seeing a transposing stereoscope 
for non-transposed 2x2 slides in Ferwerda's book, which is I think exactly
like the viewer for the Pentax Stereoadaptor is to modify that for a camera.
This would work to tranpose the images and be viewable in the 3Discover as
Grant's idea above suggested. The mirror viewer is slightly modified as
shown below.

                           In this modification, instead of using a RBT, a 
     /                /    3 lenses lenticular camera is used. The two 
    /                /     outside lenses are used to capture the 3D image.
   /                /      The reason for using the lent camera is first 
                           it's cheap (in cost) and second there is a 4p 
\                \         spacing which would work with the 4p spacing of
 \                \        the 3Discover viewer. The only difference would
  \  ___   ___  ___\       be that of course the images would be 4p wide
      l          r         compared to full width with the RBT. The working
                           of the arrangement of fig.2 is such that the 
left bottom mirror reflects the left image to the right bottom mirror and
onto the r lenses. And so on with the top right mirror which would reflect
the right image to the top left mirror and onto l lens. Now all this looks
fine and dandy on paper but haven't actually tried it out. As the usual
problems with stereoadaptors, I think there would be similiar problems with
this too. Also there could be some obstruction of the angle of view from
the mirrors for close objects. 

  _G  ab ri e_l      _G a br ie _l    jacob@xxxxxxxxxxxxxx  
 | \   you   |\    /  \ you    / \ 
 |   seeing  |    /  seeing   /    
 .----._.----.   .----._.----.     
 | 3D / \ 3D |   |3D  / \3D  |     
 '---'   '---'   '---'   '---' 

   


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