sony ?7r iv full-frame mirrorless interchangeable lens camera (ilce7rm4/b) (renewed) sony thanks to an evolutionary leap in image processing power and efficiency, the sony a7r iv combines a high-resolution 61mp back-illuminated exmore r cmos image sensor with impressive shooting speeds of up to 10 fps with full af/ae tracking, as well as beautiful 4k hdr video, wide 15-stop dynamic range, and high sensitivity with area-specific noise reduction of almost a full stop.