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Some time ago I bought one, then a second, 50mm f1.5 Zeiss Sonnars in Leica screw. With expertise from the Forum I learnt that the first was a genuine war-time example. The other I think is a Russian occupation period lens. Today I received another purchase. A Zeiss Jena Biogon 35mm f2.8 in Leica screw. The question is when was it made? The serial number says 1938 but is that too early for a wartime screw version? though my occupation period Sonnar has a prewar serial number probably taken from an unused spare part front ring. The meter distance symbol is a small “m” which is good but the decimal point, as in 2.5 meters is a “.” rather than a “,” but I have seen pictures of others with a “.” The lens comes with a good story. The seller says the it came from a collection discovered in a photographic studio in Alexandria Egypt that had been closed for 50 years. The focus and diaphragm are smooth, but the glass needs a good clean. Any advice, comments etc welcome.
