TREN
Sony DSC-RX100 read noise vs ISO
The Sony DSC-RX100 was measured at 9 ISO settings from ISO 80 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (125) read noise is 3.81 DN, or 10.1 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 3200 don't change analog gain (digital push). Full well at base ISO is about 40,970 electrons; unity gain is around ISO 330.
Sony DSC-RX100 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 80 | ○ 3.811 | 1.93 |
| 100 | ○ 4.532 | 2.18 |
| 125 | 3.811 | 1.93 |
| 200 | 5.352 | 2.42 |
| 400 | 10.556 | 3.40 |
| 800 | 19.027 | 4.25 |
| 1600 | 35.261 | 5.14 |
| 3200 | 65.799 | 6.04 |
| 6400 | ▼ 100.427 | 6.65 |