|The printed disc is missing from the shutter speed selector|
The lens that came with the camera is a Pentacon Prakticar lens. Its focal length is 50mm - so 'normal' for 35 mm photography (ie se pretty much the same view as a human eye) and its maximum aperture is f/1.8. Its minimum aperture is f/16. The focal range is from 0.45 metres to infinity. As was usual with film cameras, there is a DOF scale printed on the lens which, among other things, makes hyperfocal focusing much easier than it is with modern digital lenses. The throw of the focusing helical is somewhere around 300 degrees - ie you need to turn the focus ring through 300 degrees to go from minimum to maximum. This makes it easy to focus accurately but hard to focus quickly. There is also an infra-red marker. If you are using infra-red film, focus is not quite the same as with visible light so you have to focus normally and then move the focus marking to the red dot. For instance, if you are focused on 8 metres move the 8 from the usual red line to the red dot. Both the line and the dot are visible on the photo below. The lens is multi-coated which is as we would expect from any lens from this period.