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50mm f/0.7

Its billed as the world's fastest lens. A limited number were built for NASA (glamor portraits in outer space - astronauts photographed only by the light of their own instruments) and Stanley Kubrik snagged a few to make some obscure movie shot mostly by candle light (yep, he spent all his money on those fancy high speed lenses and couldn't afford real lighting).

Here is a picture of one. And here is a page by the guy who modified the lenses for Kubrik.

PS. You've probably figured out I was kidding about some of the stuff about astronaut portraits and Kubrik running out of money...

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