Leitz's vintage M39 telephoto — the Hektor 135mm in screw mount for early Leica cameras.
The Leitz Hektor 135mm in M39 Leica Thread Mount is a classic telephoto prime from Ernst Leitz Wetzlar designed for the Leica screw-mount rangefinder camera system. The Hektor designation was applied to several focal lengths across Leitz's lens range at different aperture classes.
The lens delivers 135mm at the Hektor aperture (typically f/4.5 for this focal length) in M39 screw thread coupling, manual focus, and full-frame 35mm coverage. Focus at 135mm on LTM rangefinder bodies requires either a reflex attachment (VIDOM) or careful distance-scale use.
The Leitz Hektor 135mm is a vintage Leica telephoto with the characteristic smooth Leitz rendering of its era. It adapts to Leica M bodies via M39-to-M adapters and to modern mirrorless systems for portrait and telephoto work. Collector value is significant for clean examples with intact rangefinder coupling.
Check M39 thread engagement. Verify rangefinder coupling cam condition. Inspect element clarity and Leitz coating. Test aperture blade operation. For M body adaptation, confirm M39-to-M adapter maintains coupling functionality.