Re: [photo-3d] Re: x-eyed viewer

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

----- Original Message -----
From: "Alan Lewis" <3-d@xxxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Friday, February 23, 2001 4:33 AM
Subject: [photo-3d] Re: x-eyed viewer


> Excerpts from what Boris wrote:
> >In general, to get a prismatic viewer to work on cross eyed pairs, the
> >prism factor has to be larger than would be necessary for traditional LR
> >pairs.  This means that the prism needs to be thicker, and that it would
> >produce more chromatic aberration...
> >...Since I used front surface mirrors in my designs I found that there is
no
> >chromatic aberration...   ...But there was a small amount of keystoning
> >introduced by the angled mirror...
> >...I'm going to have to try out a PokeScope, it sounds like a neat
device.  I
> >like neat devices...

Yes, the PokeScope certainly is a neat device.   And, here is another one.
If you make a viewer from four front surface mirrors like this, you will be
able to cross view with no abberations, and no keystone distortion:

                                            L  ^ ^  R
                                           #1 \    \ #2
                                           #3 /  /   #4
                                                _  _

(Sorry, I can't picture 45 degree angles without HTML, but I think you get
the idea).  Counting the mirrors from the upper left, #1 is silvered on the
right side, #2 on the left, #3 on the right, and #4 on the left.  The "^ ^"
symbols are your left and right eyes.   The "_  _" symbols are the stereo
pair.  If the left eye is looking into the #1 mirror, it will see the right
image being reflected up from the #2 mirror to the #1 mirror to the left
eye.  If the right eye is looking into the #4 mirror, it will see left image
being reflected up from the #3 mirror to the #4 mirror to the right eye.  If
this is confusing, redraw it with the forward and back slash symbols at 45
degrees, and I think it will be more obvious.

JR


 

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