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I think you need two lenses to get enough info for 3d. DXG has a cheapy if you just wanted to mess around. http://www.dxgusa.com/products/dxg-3d.html

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Nope, not at all. This is in essence digital holography.

(In holography, each "pixel" captures along the 3rd dimension of angle of incidence. The image is reconstructed simply by each pixel reflecting/emanating light as a function of its angle of incidence.)

Thanks for making me waste an hour of my time reading about digital holography ;) Pretty cool.

3d is one of the claimed features of the Lytro: http://blog.lytro.com/news/it-gets-better-lytro-3d-demo/

oh very cool.

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