Whenever I look through the waist-level viewfinder on my Mamiya 645 medium format SLR, I have this immense feeling of depth. Almost as if the image was 3D.
Then one day I started squinting my eyes. Left, right, left, right, .. and I noticed that in fact each eye sees a slightly different picture.
TWO DIFFERENT IMAGES.
THROUGH ONE LENS.
ON A SCREEN.
That's kind of the definition of 3D vision right there. Implemented in a 30 year old camera.
My best guess for an explanation is that instead of being a point, the lens is a surface, and thus light can travel through it in different paths. How the different paths reach the different eyes is a different question.
I see you shake your head in disbelief... let me convince you with this video I just made
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