Sony has finally made its version 5.0 firmware update available to owners of its A9 mirrorless camera.

The update’s main focus is the newly-developed Real-time Tracking AF mode, which uses machine-learning-based object recognition to identify and follow moving subjects, even if they turn away from the camera or are temporarily obstructed in some way.
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https://www.techradar.com/news/sony-a9-finally-gets-its-real-time-tracking-boost-through-v50-firmware