Early collapsible Leica M-mount Summicron 50mm f/2 — compact vintage Leica standard lens.
The Leitz Summicron 50mm f/2 Collapsible is an early Leica M-mount standard lens that retracts into the camera body for compact storage. The collapsible design was a practical feature that made the camera more pocketable, continuing a concept from the earlier Leica thread-mount Elmar and Summitar lenses.
Optical quality is very good for its era with the Summicron formula delivering sharp, contrasty images that earned the Summicron name its legendary reputation. The rendering has a distinctive vintage character — slightly warmer and less clinical than modern versions — that many photographers find particularly appealing for portrait and street work.
Build quality is to Leitz's precision standards with chromed brass construction. The collapsible mechanism requires careful handling to ensure it locks properly in both extended and retracted positions. The M-mount bayonet provides direct compatibility with all Leica M-mount cameras from 1954 to the present day.
Highly collectible and still functional for daily use, the Collapsible Summicron 50mm is sought after by both collectors and active photographers. On the used market, it commands strong prices with values driven by condition, serial number range, and the enduring appeal of early Leica M-mount optics.