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PT2405. Prototype lens, calculated by GOI in 1959. Focal length - 5 cm (5.2 cm), aperture range f1.5 - f22. Focusing range from 1m to infinity. Number of elements/groups: 7/4.  Angular field - 45º. Kiev (Contax) mount. 

Picture opposite scanned from GOI Catalogue (1963).


PT2405 - Orchid-3 prototype lens (Kiev mount).



PT2410. An only so far known Orchid-3 prototype lens for Zorki mount. Released in KMZ factory, year unknown. Totally different body design in comparison with Jupiter-3 (1.5/50 mm) lens, see comparison picture below.



PT2410 - Orchid-3 prototype lens  #00004.