Industar I-23U 110/4.5 [V2]

Tessar enlarger lens made by LZOS and its satellite KMZ factory. The Anglicised name is Industar I-23U. Early versions of the [V2] – c.1960-1964 – are marked “И-23У”; later versions lose the hyphen and are marked “И23У”. During its long production run there were several cosmetic changes. Mid-period lenses (c.1975) acquire multicoating. Improved, more colourful coatings are present on lenses post-c.1982.

Dimensions 110 mm
Focal Length (mm)

Max Aperture (f)

Min Aperture (f)

Aperture Blades


Image Circle (mm)

Rear Mount

Front Thread


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