This Nexus Stock Camera App comes from the new Google Play Edition phones, come with brand new interface, you'll be able to snap a Photo Sphere, Panorama, video, and take regular photos ofcourse!
Install at your own risk, i not sure if, it'll work on other phones, i'm hearing on some forums that it does, but atleast those waiting for Samsung to hurry up and release 4.2.2 or 4.3 (I'm hearing you might not get the G4 camera or PhotoSphere feature) will be super happy 
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P.S if anyone creates any cool PhotoSpheres share them here!
