Rare and fast Olympus industrial lens with aperture from f/2.3 to f/8. Marked Autologic. Very heavy lens with no focus and no screw to mount. The glass is good but some light coating scratches and bit haze. Back focal lenght is appr. 5Cm. Infinity is reached. Glass diameter app. 11cm. Lens height over 14cm. Large and heavy lens. Coverage will do for medium format, but no 4x5inch