Commonly used bayonet technical parameters: bayonet ring type bayonet ring diameter (mm) rotation direction fuselage image field positioning distance (mm) Brand A uses bayonet with three claws 50 clockwise 44.5Minolta AFAR, three claws 47 clockwise 40.5KonicaC/Y, three claws 48 clockwise 45.5Contax, YashicaPhenixEF inner claw 54 clockwise 44Canon EOSF inner claw 47 counterclockwise 46.5Nikon, PhenixFD/FL outer claw 48 clockwise 42. 1 Canon T, A, FFX inner claw