Praktiflex. Another German camera from before the war. It was produced in the period from 1939 to 1949. As it says in Wikipedia, a bit cruder and differently constructed tha the better known Exaktas from Ihagee. Made in Dresden, that seems to have been a centre for making good optics. The version you see here has Zeiss lens, and a screw lens mount. Later on the factory made a camera that was my first single eye reflex camera, a Praktica. The long lens in the background is a Russian made tele lens. I cannot see a lot of light getting through that narrow tube, however.