Image courtesy: Pstechnik.de
I guess you read it on the web. Plenty of websites reported about the unique Zeiss f/0.7 lens which has been used by Nasa and Stanley Kubrick. You can now rent that lens at Pstechnik.de. But there is no way it fits on your NEX camera. That’s why I wanted to remind you that there is an almost as fast lens you can actually really use! It’s the De Oude Delft 50mm f/0.75 (here on eBay).
The Photographer Aldo Navoni used the De Oude Delft 50mm f/0.75 (!) on the Sony NEX-5 and you can see the pics on his Flickr page (Click here). It’s doesn’t have the glorious history of the Zeiss lens but if you need as much speed as it gets this is what you have to buy.
You can get the lens on eBay (Click here).