Now you can build a light field camera at home!!. This video describes how to convert your camera into a light field camera using a printed cosine mask (transparency). Total cost is less than $10.
Start with a medium format digtial SLR (e.g. Mamiya) with a detachable CCD back. First remove the digital back from camera. Then remove the IR cut filter on top of the CCD. Insert a printed cosine film mask (Cost less than $10) on top of the sensor. Replace the IR cut filter. And viola, you are ready to go.
The captured photo with the mask on top of CCD will be a "light field" photo which can be used for refocusing after the photo has been taken.
For more info about how to print the mask and process the light field photo, visit
http://web.media.mit.edu/~raskar//Mask/
http://www.umiacs.umd.edu/~aagrawal/sig08/BuildingLightFieldCamera.html
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