For the low, low price of $79,995.00 you can what is the widest lens ever produced (on the 35mm format), the Nikon 6mm 2.8. This massive lens has a field of view of 220°. For reference a human eye has almost 180°. A standard portrait (taken at 55mm), usually has 76° field of view. That means that the lens can see behind itself. Let that sink in for a bit.
The lens was only ever a special order, and it’s original purpose was for scientific expeditions of Antarctica, so scientists could take pictures of the sky, and the horizon at the same time. I wish they would digitize some of those
Here’s a video of the unboxing of one. It’s not a true unboxing, because this lens hasn’t been made in 30 years, but the unboxing of a Fed-Ex delivery of one. Still, it’s pretty amazing to see this next to a person.
And here’s another video of the lens actually in use, you can see that it can see behind you: