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Industar-71 (prototype)

  

PT4270. Prototype lens, released by GOI in 1972 (?). Focal length - 4.7 cm, aperture controled by external metal strip with round holes of different sizes. Focusing range from 0.8m to infinity. Number of elements/groups: unknown.  Angular field - 46º (unconfirmed). Zorki (M39) mount. An earliest so far known lens has s/n #7259 (PhotoHistory.ru). Would be happy to know more about the particular lens.















Lens #7260 opposite from Viktor Suglob (Belarus) collection.


  

 
 

PT4270 - Industar-71 prototype lens  #7260.