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The M Files 12: Zeiss ZM Biogons 21 and 28 and Tele-Tessar 85 - Macfilos
Amazon.com : Zeiss Ikon C Biogon T* ZM 2.8/35 Wide-Angle Camera Lens for Leica M-Mount Rangefinder Cameras, Black (1486-393-L) : Camera Lenses : Electronics