re:Freeviewing

[P3D Norm Goldblatt <normgold@xxxxxxxxxx>]

Dear Richard who finds it easier to parallel free view--

Now, here's how I taught myself--I tried to reason through it. Your left
eye has to look at the right picture and right eye has to look at the
left picture.  To ensure and encourage this,  stand about 6 feet away
from the stereo pair. Hold up your index finger at arms length in front
of you. Now, close your left eye. Move your head or your finger so that
your finger is just below the left picture as seen through your right
eye.  Now, wink the other way- open your left eye and close your right
eye. The finger now seems to move over towards the right.  Now blink
back and forth.  Your finger seems to move back and forth as well
(parallax and all that). Move your finger towards and away from you. At
a particular distance in front of you, blinking will cause the finger to
appear directly under first the left picture and then directly under the
right picture.  OK- Here comes the fun part.  Open both eyes and look at
your finger, NOT THE PICTURES YET.  Directly behind your finger, will be
the picture.  You will actually see three pictures, the middle one being
behind your finger. SLOWLY direct your attention to the middle picture.
It will be stereographic and you can move your finger out of the way.  6
feet is pretty far away, but it's easier to start here and slowly move
closer once you know what your eye/brain is supposed to do. 

The most frustrating part of this whole thing is not knowing if the pair
you are looking at is meant for crossed or parallel viewing!   As a
matter of fact, I find getting a good, if pseudoscopic, fused image
viewing crosseyed at a parallel viewing pair very difficult. Whereas,
when viewing appropriately, the stereo image 'snaps' into fusion--It's
got to be completely psychological, since all the physical parameters
are the same.


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