This is an extremely rare Astro-Berlin Tachonar 75mm f1.0 lens. This is a lens only, without diaphragm or focusing helicoid. Optics are free of haze or fungus, with some dust; the front coating has a fingerprint etched onto it, but this is on the coating only: there's no effect on the glass itself. This lens will easily cover full frame at infinity, with enough flange distance to be adapted to a mirrorless camera. This lens will not fit any specific camera as-is: it's a lens only, without helicoid, mount, or diaphragm.