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The Industar I-51 was a large format 210mm f4.5 lens. A solid piece of optics made by KOMZ in Kazan, often found on FKD 13x18cm large format travel cameras. It had 20 aperture blades to stop down from f4.5 to f32 with round opening at all sizes. Its brand name Industar was used for all similar 4-element/3-group lens constructions of the whole soviet photo-optical industry.