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Sony Announces its Next Generation α6400 Mirrorless Camera with Real-time Eye Autofocus, Real-time Tracking and World's Fastest Autofocus – sonyalpharumors
Sony Autofocus Realtime Tracking AF: A7R IV, A7R III A7 III & IV, A6100, A6400, A6600, A9, A9 II, A1 - YouTube