3/4/2024 0 Comments Contax serial number lookupThe conversion for use on an M42 screwmount SLR as in the photo, involves a slender M39-M42 adapter ring (flange distance is the same). This is obvious due to the presence of a preset aperture ring. I should note that the J-9 was also made in M42 (SLR) and Kiev-Automat bayonet (lacks aperture ring). These are readily identified by their having a fully manual aperture mechanism. The rangefinder versions (LTM and Contax/Kiev) are designed for shorter flange distance and cannot be readily converted or adapted for SLR cameras, though they may be used without modification on mirrorless digital cameras with available adapters. For now, I think it is a 1956 Zenit lens. I won't rule out a cut-down Contax/Kiev J-9 except that the rear element should protrude farther. Edit: The OP's lens does have a manual aperture and may be something unusual. ![]() M39-LTM (Leica thread mount, rangefinder).The Jupiter-9 was made in multiple mounts of which two are superficially similar. I believe that the OP on this thread was misinformed regarding his lens being some sort of conversion. ![]() Or are there different factors i should consider?Welcome to the Pentax Forums!
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