A lens with such shallow DOF is difficult to insure proper focus for stills... just imagine how difficult it would be to maintain proper focus on a movie camera.
I heard something about a scene in Apocalpse Now. At the end where Colonel Kurtz is making his confessions by candlelight, the lens is supposedly a Russian custom lens with f/0.7.
Yup.. those Canon 50 f.95 lenses are pretty difficult to find in good condition. I've seen two so far. One was in great condition for about 1200 bucks but it still had the original canon mount. The other had been modified to a leica screw mount. Its physical size is pretty impressive... larger than even the noctilux. I've never seen a sample from such a lens though.
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