Wow, what fun this is! I got given this Zeiss about six months ago, it was going to be thrown out. This camera is from the 1940’s because of the D.R.P. marking (Deutsches Reichspatent) – in fact pre ’45. It’s in pretty good shape. The Box Tengor has one shutter speed – 1/30 second and bulb. There’s three f-stops – 11, 16 and 22. Focusing is of the zone variety, three settings available. That is it. Pick your film wisely for the type of weather/light you have and work it out from there with a light meter. This maybe a super basic piece of kit but it really has it’s own character – get it right and the images are just beautiful. Here’s a selection form a couple of rolls of Tri-X I have run through it.