[photo-3d] Re: Freeviewing exercise, Stereo Zipper

[abram.klooswyk@xxxxxx]

Robert Thorpe wrote on freeviewing exercises (27 Feb 2001, 
01 Mar 2001)
>...parallel freeviewing. I have put together a simple web 
>page with the various views stacked one on on top of the 
>other.(...)      <http://www.skep.com/3D/freeview.htm>

Interesting exercise, which resembles an old exercise, which 
can be found e.g. in F. Drouin "The Stereoscope and 
Stereoscopic Photography" [translated from the French], 
London 1894, Facsimile produced by and available at 
Reel 3D Enterprises <http://stereoscopy.com/reel3d>.

On page 79 you see (in very bold face, characters 11 mm high):

                                            SS
                                           T  T
                                          E    E
                                         R      R
                                        E        E
                                       O          O
                                      S            S
                                     C              C
                                    O                O
                                   P                  P
                                  E                    E

Depending on the type of font this may look odd on your 
screen, but modifying it in a text editor is easy. In Drouin 
the lowest E's have a separation of almost 80 mm.(Robert 
Thorpe's lowest picture has some 90 mm separation on my 
screen.) 
Some 25 years ago the character exercise has been called the 
"Stereo Zipper" in the Bulletin of the (British) Stereoscopic 
Society, where is was reproduced.

Robert:
>you may not want to start with the very smallest view because 
>of the lack of detail.

The picture of the Old Capitol Building in Iowa City, Iowa is 
probably the most important picture of the world, in Iowa :-), 
but for stereo exercises it could maybe be replaced by a 
picture with larger (coarser) details, but not less contrast. 
But there is no need to make it so boring as the zipper shown above 
(just a suggestion).

Abram Klooswyk 


 

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