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PT4105. Prototype lens, calculated by GOI in 1956. Focal length - 5 cm (5.2 cm), aperture range f2.0 - f22. Focusing range from 1m to infinity. Number of elements/groups: 7/5.  Angular field - 45º. Zorki (M39) mount.

Sample opposite scanned from GOI Catalogue (1963).  


PT4105 - Orchid-1 prototype lens.