Sony's new A7R III is a direct shot at Canon's full-frame throne

Sony surprised the camera world this morning when it finally announced the new Sony A7R III, the long-rumored third iteration of one of the company’s best digital mirrorless cameras. It ships in November, and will retail for $3,200, according to Sony.The A7R III uses a full-frame, 42.4-megapixel sensor, and borrows heavily from the A9, Sony’s ludicrously fast professional flagship that was announced earlier this year. It shoots 10 frames per second (RAW or JPEG) with autofocus tracki