Industar-23U 4.5 / 110 - a lens from large format enlargers. Designed for a frame format of 6.5x9 cm. Produced since 1955.
Optical scheme of the lens: 4 lenses in 3 groups.
On the copy, the name is marked in abbreviated form - I23U 4.5 / 110.
Weight with case 127g
The lens is light and therefore it is convenient to work with such a design.
The lens has a 6 blade aperture. The diaphragm closes smoothly. Values 4.5-5.6-8-11-16 are marked on the scale. The aperture control ring is brilliant. The lens barrel itself is painted dark gray.