Leica started out as a microscope company, like Zeiss.
When I worked at Leica Microsystems 1980-2000 we sold many large format cameras for use on microscopes. 2 1/4 x 3 1/4 for polaroid up to 4 x 5 inch for polaroid and film.
The shutter unit was like a compur and was vibration free and the film box fitted into the shutter unit. An exposure meter was built in and in the Vario Orthomat had a movable measuring spot.
The microscope objectives only have a maximum aperture to obtain highest resolution. Each objective is optimised for light controlled by the condenser.
There is a lens in the film box that fills the film area fully.
1x for 4 x 5 inch film, 0.3 x for 35mm film etc.
These cameras appear in Leitz (Leica) catalogs from the earliest days of the company.
Oscar Barnack developed the Leica because he did not want to carry a large camera on his rambles. But the company continued to make them.