Sony today introduced the a7 IV, upgrading the Alpha system’s most affordable entry into full-frame mirrorless cameras with several features and technologies inherited from the line’s top-tier models. Sony a7 IV The 33-megapixel Sony a7 IV will feature the same BIONZ XR processor in the flagship Sony a1, and though it’s not as fast for burst shooting as the a1, it is capable of continuous capture at up to 10 fps with autofocus and autoexposure tracking. Also like the a1, the AF system employs 759 phase-detection points on the sensor that enables Real-time Tracking and Real-time Eye AF that can now follow birds’ eyes, another feature introduced in the a1. Top view of the a7 IV. For both stills and video,...