I came across a Carl Zeiss Jena pair of binoculars the other day they were 7x40 B GA. I was a bit surprised at how good they were. Clearly ex military from the second world war I guess, they had no focussing as they were in focus at all times. I've not come across this type before. The picture from close up to a very long way away was sharp and clear.
Has anyone had any experience of these and what do you call this type of binocular?