grahamp
Subscriber
What is the actual focus distance from the ground glass back? If the natural focus is around 1-2 feet, I'd suspect it was designed as an instrument camera. I have seen some unusual setups for older electron microscopes (the newer ones don't even use film). Just because the film format is 2 1/4 3 1/4 does not mean that the image will be full frame. The back might be convenient for reasons of film stock, handling, etc. It does not make a lot of sense as a general purpose camera.