Hello everyone, need your collective experience to come up with solution to this shot. I need to take a shot through the astronomical telescope and see the moon. It’s an old Zeiss Jena telescope, with no possibility to attach camera directly to it. At the same time i need to see a face of the telescope viewfinder, as we attach something to it. Both image projected from the telescope (i.e. moon) and viewfinder face have to be in focus at the same time. I was thinking to use custom made split diopter lens, with hole in the middle. How do i calculate needed diopter and can simple magnifying glass work for it? Or maybe there is completely another solution available, that i’m missing?