Rodenstock of Munich, Germany is world famous for its superb enlarging lenses and excellent large format camera lenses.
Rodenstock produced Imagon lenses are preferred by professionals for adding a special softer touch to portraits and romantic shots. Imagon lenses have special strained aperture inserts punctured in various sizes. Exposure in the middle of the image is adjusted by a corresponding gray filter which is getting darker towards image center.

Imagon lenses were first introduced in 1928 (named Anachromat Kühn). They were equipped with a Compur leaf shutter. Pictured here is an Imagon lens with a Copal #3 large format shutter unit.

Left: set of strainer inserts with lens.