During a live presentation in New York City this morning, Sony revealed its latest full-frame mirrorless camera, breaking new ground in this ever-more crowded market with the Sony a7R IV: the world’s first 61MP full-frame camera, with a burst speed of up to 10fps, and a reported 15 stops of dynamic range. Sony claims that the a7R IV sets “new standards” in image quality and operability. The BSI CMOS image sensor inside is brand new, making it the first true…