Fritz Kricheldorff Spiegel-Reflex-Klapp-Camera

Small, light and reliable (ad of 1910) scanned by Uwe Kulick  (Image rights)

Fritz Kricheldorff was a camera maker based in Berlin, the capital of Germany. His Spiegel-Reflex-Klapp-Camera camera was a completely foldable compact SLR. The mirror finder system inside the camera was folded too when the camera was collapsed. It was a plate camera that looked like a rollfilm strut folder. But the sides contained just the rouleau of the focal plane shutter and no film rolls. The Modell 1910 was made for 9×12cm plates and had a Tessar 1:4.5/150mm lens. An earlier model had a Doppel-Anastigmat Serie III/0 1:4.6/120mm lens.