Every now and then, we stumble upon someone ‘hacking' a lens (see 102 year old lens stills and a video) and this one looks pretty cool on top of the Canon EOS 5D Mark II – not often you see a bellows on a modern HDSLR! Hack by Alex12Ga on flickr
Zeiss NETTAR 1949 – 60 years later
From the flickr page
Novar-Anastigmat 75mm f/3.5 lens (6×6) circa 1949, mounted w/ original bellows on 5D2. That's a $60 DIY view camera Add-on, hardware and elbow grease included. This allows for macro (up & down from lens mount), Tilt (top nob) Shift (bottom & side nob) and swing (bottom nod).
A view of the back of the hack
Gee that rhymed HA