My new Canikon V1
Got a fairly inexpensive Nikon 1 to Canon FD lens adaptor out of Hong Kong. For $20 it's interesting but also completely manual. Makes the lens into a 1080mm f4.5 but you need very steady hands or a tripod!
Shot below is full frame of the top of a crane several miles away. Only steadied the camera on the top of a car. Very difficult to frame a shot handheld and with full manual settings it takes a bit of tinkering but since I already have a few old FD lenses floating about seemed like an interesting experiment.
There is also a Leica M adaptor, also fully manual.