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2006. Sovietcams.
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PT2705. Prototype lens, calculated by GOI in 1934. Focal length - 5 cm, aperture range f2.0 - f18 (?). Focusing range from 1.25 m (?) to infinity. Number of elements/groups: 4/3.  Angular field - 46º. Seems to be calculated for Fed (Leica) mount.

Sample opposite from GOI Catalogue (1963).


PT2705 - Caleynar 2/50mm prototype lens.