Leitz Summicron M 50mm f2 Collapsible Mount: Leica M-mount Appearance: Despite being a lens over 70 years old, it is a beautiful item in excellent condition, without any dents or dings, and retaining a beautiful luster. Please check the photos. Optics: There are some minor scratches and dust visible due to aging when viewed in strong light. There may also be slight haze, but it appears clean to the naked eye. There are no issues during normal shooting. Operation: There are no major problems with the operation during normal shooting. The focus ring moves smoothly, but there is a point where it feels slightly heavy, and there is a slight scratch in the movement of the aperture ring, but neither of these will interfere with shooting. The infinity focus stop is also not a problem. Included: Lens cap (third-party), rear cap (third-party) Serial number 1279013 (made in 1954) M-mount, can be mounted directly on M-series Leica cameras without an adapter. I purchased this lens last May and have used it on a Leica M-P240, and it has been used in photo exhibitions and contests. As I have acquired more old lenses, I am selling this one to buy the next Summicron 3rd. Please make your decision based on the photos and description, and no claims or returns are accepted.