blue bubble: 20150528-DSC08049_Rodenstock Karat Heligon 50 mm F2.0 from Agfa Karat 36 modified to L39 mount
blue bubble: 20150528-DSC08058_Rodenstock Karat Heligon 50 mm F2.0 from Agfa Karat 36 modified to L39 mount