Industar I-23U 110/4.5 [V1]

Tessar enlarger lens made by LZOS and its satellite KMZ factory. The Anglicised name is Industar I-23U. [V1] has a smooth black-enamelled body with a red “п” and is marked “И23-У” (note the hyphen) and “F=110mm”. [V1] is the designation we have given single-coated lenses produced between 1955 and c.1960 that have 10-blade circular apertures and a minimum aperture of f32.