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The pictures below can be viewed in 3D using the cross-eyed (or Freeview)
method, without any special equipment.
How to achieve Cross-Eyed Viewing
Pairs of stereo images designed for cross-eyed viewing have the left
eye image on the right side and the right eye image on the left. To
view a picture in stereo, cross your eyes so that the two halves of
the image merge together. Try crossing your eyes and then relaxing a
few times if you haven't used this viewing method before. Next,
concentrate on one significant part of the scene, preferably near the
centre of one of the pictures. Once the images merge you should be
able to move your eyes around the scene and study each part, just as
if you were looking at a normal photograph. You can also try moving
nearer or further away from your monitor, as appropriate. When you are
practiced at Cross-Eyed viewing, you can 'lock-on' to a picture
immediately to see it in it's full stereo glory!
Don't be discouraged if you don't
achieve the stereo effect straight away. Most people can achieve it
fairly quickly, but with others it takes practice. One important thing
to remember is that if you are not used to using this viewing method
on a regular basis, the eyes can become very tired quite quickly,
don't overdo it or you will get a head-ache!
ROMO Stereo Viewers

Sawyers
Marine Blue Model B

Sawyers Marine Blue x 2 and a Blue/Black Model B
 Sawyers
Model D View-Master

Jollyfilm Movie Viewer

A pair of GAF Model 12 View-Master
Viewers

A USA Model H and European
Model H behind

A Sawyers Junior Projector

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