Sony’s full-frame camera family just got larger with a superb, but expensive mirrorless flagship, the A7R II. The new model is one of Sony’s highest resolution cameras ever at 42.4-megapixels, handily whupping its predecessor, the 34.6-megapixel A7R. It also has the “world’s first back-illuminated full-frame sensor,” according to Sony, giving it high sensitivity (up to 102,400 ISO) to go along with all those pixels. It gets the 5-axis stabilization system from the A7-II, but unlike that camera, shoots 4K video that’s sampled from the entire 35mm sensor.
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https://www.engadget.com/2015/06/11/sony-a7r-ii-mirrorless-full-frame-camera/