NASA paid scientists at JHU/APL to build a spaceship and fly it all the way to Pluto. That spaceship contained a camera, called [Lorri](http://pluto.jhuapl.edu/Mission/Spacecraft.php#Payload ), which was specially engineered to take pictures at the light levels expected at Pluto. It’s not some off-the-shelf smartphone camera.
From the post you cite:
>It’s quite amazing how much detail is added when you can get the camera 5 billion km closer.
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