There are not many videos out there which have been shot with a f/0.75 aperture lens(!) and a Micro Four Thirds camera. The maker of the video is seelling that Kowa 44mm f/0.75 on eBay: “This is a very unique and beautiful lens that produces a soft blur due to its fast aperture.I tried it also with the HD video mode on my Panasonic GF2 and the result was stunning. This lens can be adapted to almost any camera as far as you buy the right adapter for it, I previously used it on my Canon 50D and on a Sony NEX 5. I can say that due to the sensor size and distance from the back of the lens, you will get better results with the NEX but any mirrorless camera (EVIL camera) is good to use with that ultra fast lens.”
Click here to see the Kowa 44mm f/0.75 auction on eBay. That lens is very cheap compared to the De Oude Delft 50mm f/.075 which usually sells for over $2000 on eBay. You can’t find anything faster than that (there was once a Zeiss f/0.7 but that’s impossible to find).