Ernst Leitz Epis 70cm Image Circle?

[Qeb]

Greetings,
I was wondering if anyone would possibly know the image circle for a "ernst leitz epis 70cm."
Google searches didn't return any answers.

Thanks in advance for any help :)

Cheers,
Kevin

[Bob Salomon]

That was from an old opaque (Episcop) projector. Probably does not have a diaphragm and was used for projecting flat objects.