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yeah, saw a univeristy research project on this a couple years back. I guess they actually commercialized it.

problem is, you essentially reduce say, a 22Mpix FF photo into say, a bunch of lower resolution photos at different focus distance at lower resolution.

It's not actually distinct photos at lowe rresolution, but instead of capturing more details, you capture different angle of light instead. End result is still trading resolution for focual data (angle of light).

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