Vintage collapsible standard prime lens for Leica LTM (M39) screw mount cameras.
The Leitz Elmar 50mm f/3.5 Collapsible is the traditional collapsible version of the Elmar — the founding lens of the Leica system. When collapsed the lens retracts into the body for ultra-compact storage; when extended it locks into position for use. This variant uses the Leica Thread Mount (L39/LTM) screw mount.
50mm focal length, f/3.5 maximum aperture, four-element Elmar formula, collapsible barrel (retracts into body), Leica Thread Mount (L39/LTM), rangefinder-coupled on later versions.
The Collapsible Elmar is the lens most associated with the original Barnack Leica cameras, enabling the camera to fit in a coat pocket when collapsed. When collapsed the lens must not be used — the rear element would contact the shutter. Sharp at f/5.6 and beyond with classic single-coated or uncoated rendering.
Test the collapse and extension mechanism for smooth, secure operation. Inspect all elements for haze, cleaning marks, and coating condition. Verify L39 thread engagement. The collapsible mechanism is the most mechanically complex part — confirm it locks securely in the extended position.