In 1960, Zeiss Ikon Stuttgart reused the Tenax name on a small viewfinder camera named Tenax Automatic that ended production in 1963. It has automatic exposure driven by a selenium meter, with a manual override to set the aperture for flash. The Prontormat-s shutter flash sync is by a PC socket hidden under a rotating cover on the top plate. It has a fixed 50mm f/2.8 Carl Zeiss Tessar lens, marked with focus zones on the top and a distance scale underneath. The lens serial number is 2916965 and the focus icons on the lens is one person from the waist up, three people standing, and a group of mountains. You can also use the number set on the bottom of the lens that ranges from 3.5 feet to infinity. The camera also has a large crank for rewinding that pops out from hiding when you push the rewind release button. Both are on the bottom of the camera with the ¼ inch 20 thread tripod socket. The selenium meter only works when the shutter is loaded and it has an ASA adjuster that moves a red viewing slot accordingly. There is also an ASA/DIM reminder plate on the back of the camera that has a dial you can set.