In my collection of useless stuff that I've acquired because I didn't know better, I have two Compur 0 shutters that have fairly limited diaphragms. That is to say, at wide open, which says f/5.6, the diaphrams are substantially stopped down. One of them has no focusing lever.

What's the background on these lenses? I have to wonder whether they were originally intended for large format use, or if they have been repurposed from somewhere else - maybe some kind of a rangefinder?