Sony RX100 has a 20.0MP 1-inch (13.2 x 8.8 mm ) sized CMOS sensor . You can shoot at maximum resolution of 5472 x 3648 pixels with aspect ratios of 1:1, 4:3, 3:2 and 16:9. RX100 has a native ISO range of 100 - 25600 and it can save files in RAW format which gives you a wider room for post processing.
Sony RX100 is not the highest resolution 1 inch Sensor camera. Nikon 1 J5 with its 21.0MP sensor is leading in this class. Check the comparison of Sony RX100 vs Nikon 1 J5 or take a look at Highest resolution Compact cameras list.
Sony RX100 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Sony RX100 sensor has been tested by DxO Mark and got an overall score of 66 for its image quality. You can find the details of their analysis of Sony RX100 here.
Let's look at how the size of the Sony RX100's 1-inch sensor compares with other standard sensor sizes.
Comparison image of Sony RX100 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Sony RX100 gives you at any given aperture.
You can
calculate
the exact depth of field for the Sony RX100
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and how close you can get before the focus zone becomes too thin.
