But I wonder if the size of the Contax II/Kiev window is compatible with the first solution: the rotating masks require more space than possible, as it seems. And even the second solution was not used by Zeiss. Perhaps they would have forced to too many modifications?
Anyway, two clever propositions much neater than a turret. Thanks, Luiz!
When I look at my Contaxes, I cannot imagine that such masks can rotate correctly in such a space... And in your last drawings, it seems that the main window is smaller than the regular ones. I wonder if such propositions would not have lead to modifications in the finder (magnification, etc.) All that to discuss: we won't have the final word! Thanks to have awakened me Amitiés. Jacques.
when you dismantle the body you will see that the inner exit prism window is much smaller then the outside camera frame. I image how beautiful would be the rotating wheel made in a transparent green disc emoldurating the original camera field. observe that this idea came in 1936 just after the first Contax II launch at least 19 years before the automatic frame finder limits of Leica M3 which was too much complicated. Regards LP