There is a new project called PONF for a film and digital camera in one and I just received the first pictures of the 3D printed model of the skeleton of the camera. Here are the camera's specifications:
Camera Body
- Type: Single-lens reflex
- Lens Mount: Natively: M42 - Other mounts available through adapters
- Body finish: Chosen by the user
- Bare dimensions (approximate): Body - LxHxW (cm): 6x6x3.8 - with no pentaprism
- Backs - LxHxW (cm): 14x8x3 - maximum
Digital Back
- Sensors: Sony CMOS image sensors, full-frame / APS-C
- Pixel count: Full-frame: 36.4 MP / 24.3 MP APS-C: 24.3 MP
- Board: RaspberryPI Compute Module
- Operating System: Linux Embedded
- Display: 5' TFT resistive touch display (10x8 cm), 4:3 aspect ratio
Film Back
- Film type: 135 film ( 36×24 mm )
- Format: Cartridges
Next is some additional information on the PONF multi-back open camera project from one of the founders: