T3D Re: Single Lens Stereoscope?

[john bercovitz <bercov@xxxxxxxxxxx>]

PJ Homer writes:
> I cannot understand how this works.

I'm not sure what it is that you don't understand.  My apologies for
being so slow.  I'll try to explain anyway.  Not knowing what I'm 
talking about should not be an impediment to free discourse.  8-)

The stereocard is on the ground and upside down to you.  You put a 
long lens between you and it.  The lens makes real images nearer 
your eyes than the object or lens.  These images are inverted.  The
lens also acts as a pinhole causing the left image on the ground to 
be directed to your right eye.  Since the image on the ground is 
inverted, its right image is on your left.  The pinhole effect, 
then, corrects this.

Was it a clean miss?  8-)

John B


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