For the record, it was Zeiss who invented the Biogon, double-Gauss and Sonnar formulae which have been copied and modified by every camera-lens maker, Leitz/Leica included.
For the record, it was Zeiss who invented the Biogon, double-Gauss and Sonnar formulae which have been copied and modified by every camera-lens maker, Leitz/Leica included.
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