Sony RX100 II vs Sony RX100 III: read noise comparison
Sony RX100 IIDxO
The Sony RX100 II (DSC-RX100M2) was measured at 8 ISO settings from ISO 100 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (100) read noise is 0.99 DN. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Sony RX100 III
The Sony RX100 III (DSC-RX100M3) was measured at 23 ISO settings from ISO 80 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (125) read noise is 3.58 DN, or 2.7 electrons at the sensor. From ISO 1000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 5000 don't change analog gain (digital push). Full well at base ISO is about 11,621 electrons; unity gain is around ISO 90.
Sony RX100 II vs Sony RX100 III read noise table
| ISO | Sony RX100 II | Sony RX100 III |
|---|---|---|
| 80 | – | 3.580 |
| 100 | 0.986 | 4.199 |
| 125 | – | 3.580 |
| 160 | – | 4.170 |
| 200 | 1.240 | 4.891 |
| 250 | – | 5.776 |
| 320 | – | 6.964 |
| 400 | 2.751 | 8.282 |
| 500 | – | 9.987 |
| 640 | – | 12.042 |
| 800 | 4.112 | 14.520 |
| 1000 | – | 17.268 |
| 1250 | – | 20.966 |
| 1600 | 7.727 | 25.992 |
| 2000 | – | 31.341 |
| 2500 | – | 37.792 |
| 3200 | 14.621 | 48.168 |
| 4000 | – | 60.969 |
| 5000 | – | 75.584 |
| 6400 | 30.484 | 76.639 |
| 8000 | – | 97.681 |
| 10000 | – | 121.938 |
| 12800 | 70.035 | 155.417 |
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