Photo by Robert Benson
San Diego-based photographer Robert Benson
had a peculiar problem--he owned a very expensive Leica Noctilux-M 50mm f/1 lens without a camera to put it on. His solution involved modifying his own Canon 5D Mark II to accept Leica mount lenses. He is now selling his services for the 5D Mark II conversion. The procedure is not for the faint of heart and will most certainly void your warranty.
See his blog post
for more details and sample images.