Used Carl Zeiss Jena P MC 50mm f/1.8 lens converted to Canon EF mount from PB mount (hard mount, not adapter). Casings of this lens looks nice, with just minimal signs of use, just check pictures. Glass in my opinion in excellent shape, with no serious issues, nice, as for old, vintage glass. As most old lenses, lens can have few micro marks/spots on coatings and few micro cleaning marks here and there. Focus ring works very smooth, with just minimal play on it. Aperture clean, close to the end. Mechanically lens is in really excellent condition, fully CLA'd, new greases, aperture clean, etc. Nice lens, very small, i would say 'pancake' type, similar to Pancolar M42 lens, but for PB mount, so different build and maybe... different look ? Nice amber coatings, totally different, than in Pancolar lens, where they are green / violet. This is 'as is' auction, so no returns or exchanges, all sales are final. I'm also not an expert in lenses, so i've described this lens the best, i could. Thank you !