You can pickup the Lytro cameras for cheap on ebay. It is a fun piece of tech to play with. There really should be a microlens array for modern cameras since the pixel counts are so high, and with AI able to do all these crazy convolutions, it could make sense out of even garbage optics.
https://www.edmundoptics.com/f/microlens-arrays/13812/
http://lightfield-forum.com/2012/05/how-to-make-your-own-mic...