Both Sony RX100 III and Sony RX100 have 20.0 MP resolution sensors but Sony RX100 III's sensor is 1″ (13.2 x 8.8 mm ) and Sony RX100's sensor is 1-inch (13.2 x 8.8 mm ).
Since Sony RX100's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Sony RX100 III.
Below you can see the RX100 III and RX100 sensor size comparison.
Sony RX100 III and Sony RX100 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
Both Sony RX100 III and Sony RX100 sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, RX100 III has scored 67, 1 points higher than RX100.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony RX100 III |
67 |
22.4 bits |
12.3 Evs |
495 ISO |
Sony RX100 |
66 |
22.6 bits |
12.4 Evs |
390 ISO |