The Leica Hektor 135mm f/4.5 is a classic manual telephoto lens produced by Ernst Leitz from 1933 to 1960. It features an optical design of four elements in three groups, with a maximum aperture of f/4.5 and aperture settings down to f/32. Its 135mm focal length is suitable for portraits and photographing subjects at a distance.
This example has serial number 1131161. The lens was produced in different versions with either a Leica screw mount or an M bayonet mount.