Industar-51

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The Industar 51 is a 210mm f/4.5 lens for large format. It was made by KOMZ in Kazan, often found on FKD 13x18cm large format travel cameras. It has 20 aperture blades to stop down from f/4.5 to f/32 with round opening at all sizes. The name Industar was used for all similar 4-element/3-group lens constructions of the whole soviet photo-optical industry.

Optical formula from OPAL database

RAD THIC GLASS DIAMETER
57.68 8.4 LZ_TK16 46
inf 9.3 AIR 22
-129.42 4 LZ_LF5 41.5
52.97 5.5 AIR 39.5
STOP 6.7 AIR
-407.4 3 LZ_OF1 40
54.080 11.2 LZ_TK20 41.5
-83.56              41.6

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