Introduction
The RX10 IV, as the name suggests, is the fourth in Sony’s series of 1″-type sensor, long zoom compacts. The Mark IV is the first to offer phase detection autofocus alongside a series of changes designed to boost the speed and capability of the camera, for both stills and video shooting.
Sony is adamant that the camera is much more than an RX10 III with an RX100 V sensor in it. Let’s take a look at what the latest version brings.
Autofocus
One of the biggest changes in the Mark IV is the addition of on-sensor phase detection autofocus. There are a total of 315 phase-detect points, which cover 65% of the total sensor area. This is a significant update as it should eliminate the RX10 III’s need to hunt for focus, which was a particular problem at the long end of the zoom.
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https://www.dpreview.com/articles/0348363938/hands-on-with-the-sony-cyber-shot-dsc-rx10-iv