The lens is very clean, with a slight amount of dust, but it does not affect image quality. It has the same structure as Meyer lenses, and the photos taken have a very vintage lens character. The depiction of suburban scenes is very soft and has a beautiful atmosphere. It is an M42 mount. If you would like the hood shown in photo 4 (new), please contact me. This hood provides excellent light-shielding effects and is a great match for this lens. This is an extremely rare lens with very limited production.