Sony's new A7R IV camera is a 61 MP full-frame mirrorless beast

The camera's image resolution is a "world first" for a 35mm-equivalent full-frame digital sensor, Sony notes, and that's not where the improvements on this successor to the wildly popular A7R III end: The A7R IV also has 10fps rapid shooting with continuous autofocus and autoexposure tracking capabilities; 567 phase-detect autofocus points that cover 74% of the frame; real-time eye autofocus tracking for stills and movies, which can handle both human and animal subjects; 4K HDR movie recording without any pixel binning and with S-Log 2/3 support for editing (although without a 60p mode, as it caps out at 30p); ISO range of 100-32000 (and 50-102400 expandable); battery life of around 539 shots with the EVF, or 670 shots without; and much more. This Sony camera is clearly a shot across the bow at recent entrants into the full-frame mirrorless camera market, including Nikon and Canon, and it looks like Sony will be upping one of its biggest advantages by offering even better subject-tracking autofocus, which is a category where it already has a strong lead.