Certo Super Sport Dolly
This is my Super Sport Dolly, made by Certo between 1934 and 38. The camera came in various models (I also have this other one). This one has a 75 mm f/2.9 Meyer Trioplan (a very common triplet lens), in a Compur shutter, with simple front-element focusing. The camera back has a removable panel, allowing you to fit plate-holders or a ground-glass focusing screen instead of roll film, which I think makes it a model C. The film mask is removable, and I have masks to do both square format and 6x4.5. The lens and shutter can also be removed, allowing you to fit a telephoto lens on a short extension tube. Mostly this feature is a liability; I would buy the tele lens if I could find one, but in the meantime I've fogged a couple of films by detaching the lens accidentally. This instruction manual covers both models of the camera.