Dpreview
The big story is of course the 1"-type stacked CMOS sensor from the RX100 VII. However, in order to keep the phone small, Sony has designed a lens that can't project an image circle large enough to cover the entire area of the 1" sensor. That's why, instead of 20MP images, as you'd get from the RX100 VII camera, you get 12MP images. But this has a broader implication: the combination of a slower F2 lens (than many of its smartphone peers) and a sensor that's not quite as big as a 1"-type sensor means the image quality might not meet the initial expectations you might have when you think 'smartphone with RX100 sensor'. In fact, if you consider just the area used for 12MP stills, it has roughly a 12mm diagonal and 70mm2 sensor surface area: closer to the specs of a 1/1.31" sensor (such as the one in the Google Pixel 6).
The Pro-I offers slightly less light-gathering & shallow DOF ability than the iPhone 13 Pro
With an F2 lens, we calculate that the main camera is then roughly F7.1 full-frame equivalent. For perspective, the iPhone 13 Pro's 1/1.65" sensor with F1.5 lens makes it F6.8 full-frame equivalent, which means the main imager on the Xperia Pro-I actually offers slightly less light-gathering and shallow depth-of-field ability than the iPhone 13 Pro, in single exposures before you consider computational imaging approaches, that is. This is something we've confirmed via signal:noise ratio analyses.
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