This is the first-generation Summicron 50mm f/2 with a fixed barrel—an early model that succeeded the collapsible Summicron. It features a distinctive design with a deeply knurled helicoid ring.

Serial number falls in the 1.51 million range, manufactured in 1957—an iconic product from the golden era just before the release of the M2 and around the time the MP was introduced. The distance scale is in meters. Leica product code: SOSIC, later changed to 11818.

It features a modified Gauss-type optical formula with 6 groups and 7 elements. Designed with a focus on contrast, it also delivers high resolution, earning it a strong reputation as one of Leica’s finest classic lenses.

The Summicron series is still in production today and remains a symbol of Leica excellence. The first-generation model is prized for its high-quality chrome finish and elegant form—beloved by collectors and shooters alike. A quintessential old lens that looks perfect on any M-mount body.

Filter size is E39. Compatible lens hoods include ITDOO and IROOA.

For an early fixed-barrel version, the exterior condition is quite clean. This model is known for the silver-painted helicoid ring that often shows wear, but on this particular lens, the silver finish remains well-preserved.

Fully overhauled in April 2025. The aperture and helicoid have been finely adjusted to provide a smooth, well-balanced torque. Rangefinder coupling is precise and accurate.

The front element shows minor coating deterioration, the middle elements have a faint haze that cannot be removed through standard cleaning, and the rear element has a very slight edge separation along the rim. However, none of these issues appear to affect image quality in actual use. Test shots yielded excellent results.