https://www.dpreview.com/news/1641689739/sony-just-packed-a-1-stacked-cmos-sensor-into-the-xperia-pro-i-but-there-s-a-catch 這篇有提到: Since there's extra, under-utilized surface are on that 1"-type sensor that is still covered by the imaging circle projected by the main lens, 4K 16:9 video cleverly uses a slightly wider field-of-view than is available for 4:3 stills, since those extra pixels are available. That means there's less of a final crop after electronic image stabilization: clever!