Leica S-Adapter M645 for Mamiya 645 Lens to Leica S2 Camera (16025) Review

The Leica S-Adapter M645 is a specialized adapter ring that allows photographers to mount Mamiya 645 medium format lenses onto the Leica S2 camera body. At $420, it sits at the premium end of the lens adapter market, reflecting Leica's precision engineering and the niche it serves. This adapter is designed for professionals who already own Mamiya 645 glass and want to leverage those optics on the S-system without investing in a complete native lens lineup.

Build quality is expected to meet Leica's standards, with precise tolerances to maintain infinity focus and proper lens alignment. The adapter is purely mechanical, so metering and autofocus functions will be manual, and any electronic communication between lens and body is not supported. This makes it best suited for studio or deliberate fieldwork where manual focus and aperture control are acceptable trade-offs for using legacy glass on a modern medium format digital system.