Just when you think you’ve got your head around light paths and optics, along comes a scientist to make you think again.
Here’s how you can build your own lens that can see an object that, according to your brain, is hidden by what’s in front of it.
As I watched, I asked myself if there could be any practical applications for such a lens and sure enough, Krasnow suggests some possible uses.
In April, Canon filed a patent for an 8mm fisheye lens that gives an angle of view of around 180 degrees.
If that’s not quite wide enough for you, in March it emerged that C-4 Precision Optics had released a 4.9mm fisheye lens for Sony E-mount that can see behind itself — yours for just $39,000.

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