There is, or was, a 65mm format digital movie camera

[BJL]

There is, or was, a digital video camera with a truly "medium format" 65mm frame width, the Phantom 65 Gold:
http://www.lovehighspeed.com/phantom-65/
However, it seems to have been discontinued after a short lifespan:
http://www.visionresearch.com/Phantom-65/

I mention this just because of recent discussion in another thread about digital IMAX format cameras and such.