Just found out about Apertus, an "open source cinema camera"
. Their mission statement is "We intend on creating an affordable community driven free software and open hardware cinematic HD camera for a professional production environment."
Shoots 1080p proprietary RAW at 30.9 fps (?), has C-mount lenses (CS with adapter), and get this: shoots only
The camera uses an Aptina CMOS bayer-pattern sensor with an optical format of 1/2.5" (5.70mm x 4.28mm) and a native resolution of 2592x1944 (5 Megapixels). It features a 12 bit ADC and supports: region of interest, on-chip binning and decimation. Aptina claims that the chip has 70db of dynamic range at full resolution and 76db when using 2x2 binning.