|cardboard sketch of the TLR camera|
Simultaneous with the start of my Single Lens Reflex camera project, I began to develop a foldable Twin Lens Reflex camera, also for large format photography. My aim is to use this camera for architecture photography, therefore it has at least to shift a wide angle lens. The other requirements were that the camera should fold up to a reasonable small package and is that it would be usable for (relatively) quick handheld photography.
|folding TLR open - and with lens board|
The construction of the body is light and simple and will be made from wooden multiplex plate material. By the way, the mirror is not yet attached to the body. One of the more delicate works is the design of the wide angle bellows, which have to move in different directions without blocking parts of the image area and without conflicting with the second bellows.
|two different bellows designs during tests|
For a quick test I made two different bag bellows. One of the bellows was an extended version of a normal wide angle bellows. The second one was a doubled bag bellows, which required some extra stabilizers.
|a more or less 'classic' bag bellows|
The classic version wasn't successful enough, as the single bag stretches too much, which deforms the side and pushes cloth to the inside. The double bag bellows worked a lot better. I knew on forehand that this design will need some inner construction that it will not sag down in the middle and it will need some tension to pull each bag to its board.
|double bag bellows with elastic rubber bands|
The next step is a wooden model with two double bellows to have a better idea of its efficiency.
all images © Norman Beierle