The first Zenit was really an RF-SLR hybrid made by KMZ.  KMZ made Zorki.  The Zenit was actually the SLR version of the Zorki.  They started by ‘fusing’ the reflex housing and prism finder on the existing Zorki-1 body.  The Leica-shaped oblong body was retained.  The Leica-style  shutter was also retained, and a reflex-mirror viewing [...]