Soviet Jupiter-11 telephoto — the 135mm f/4 in M39 screw mount for LTM cameras.
The Jupiter-11 135mm f/4 is a Soviet telephoto prime in M39 Leica Thread Mount, produced by KMZ (Krasnogorsky Mekhanichesky Zavod) based on the Carl Zeiss Sonnar 135mm f/4 optical formula. Soviet optical factories copied several Zeiss designs after World War II, and the Jupiter-11 is a direct Sonnar derivative.
The lens delivers 135mm at f/4 maximum aperture in M39 screw thread coupling, manual focus and aperture, and full-frame 35mm coverage. Build quality reflects Soviet optical manufacturing of the period.
The Jupiter-11's Sonnar lineage gives it a characteristic smooth rendering quality that mirrors the Zeiss Sonnar's out-of-focus character. It adapts to Leica M and all major mirrorless mounts via M39 adapters and is popular among vintage glass enthusiasts seeking a budget Sonnar rendering.
Test M39 thread coupling for clean engagement. Inspect element condition — Soviet lenses frequently show internal haze from lubricant migration. Check aperture blade operation. For M body adaptation, M39-to-M adapter enables rangefinder coupling.