the first true 35mm slr autofocus camera that had a successful design was the minolta dynax/maxxum 7000, introduced in 1985. this slr featured a built-in motor drive and dedicated flash capability. minolta also introduced a completely new bayonet mount lens system, the maxxum af lens system (currently known as the sony a-mount), which was incompatible with its previous md-bayonet mount system, in which the lenses' focusing action was driven from a motor in the camera body. this reduced complexity in the camera body and the lens. canon responded with the t80 and a range of three motor-equipped "ac" lenses, but this was regarded as a stopgap move. nikon introduced the n2020 (known in europe as the nikon f-501), which was their first slr with built-in autofocus motor, and redesigned autofocus auto nikkor lenses. nikon's af lenses, however, remained compatible with older nikon 35mm slr cameras, and older manual focus nikon lenses could be used with varying degrees of compatibility on the new af cameras.