The successor to Sony's highly acclaimed A7R III has arrived. Today, at an event in New York City, the company introduced its A7R IV, a full-frame mirrorless camera that comes with a whopping 61-megapixel Exmor R sensor. Sony says this new shooter is all about offering "medium-format-level" image quality in a package that's both compact and lightweight. In addition to that pixel-packed sensor, the A7R IV features a 15-stop dynamic range, ISO sensitivity up to 32,000, continuous shooting up to 10 frames per second (with auto-focus and auto-exposure tracking) and 567 phase-detection points cover around 74 percent of the frame. Simply put, this thing is a powerhouse.