TREN
Sony RX100 IV read noise vs ISO
The Sony RX100 IV (DSC-RX100M4) 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 3.25 DN, or 2.8 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 13,145 electrons; unity gain is around ISO 110.
Sony RX100 IV read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 80 | ○ 3.249 | 1.70 |
| 100 | ○ 3.758 | 1.91 |
| 125 | 3.249 | 1.70 |
| 160 | 3.732 | 1.90 |
| 200 | 4.347 | 2.12 |
| 250 | 5.242 | 2.39 |
| 320 | 6.148 | 2.62 |
| 400 | 7.362 | 2.88 |
| 500 | 8.815 | 3.14 |
| 640 | 10.556 | 3.40 |
| 800 | 12.906 | 3.69 |
| 1000 | 15.242 | 3.93 |
| 1250 | 18.636 | 4.22 |
| 1600 | 22.316 | 4.48 |
| 2000 | 27.096 | 4.76 |
| 2500 | 32.900 | 5.04 |
| 3200 | 42.224 | 5.40 |
| 4000 | 52.710 | 5.72 |
| 5000 | 66.718 | 6.06 |
| 6400 | ▼ 67.182 | 6.07 |
| 8000 | ▼ 84.449 | 6.40 |
| 10000 | ▼ 106.891 | 6.74 |
| 12800 | ▼ 135.298 | 7.08 |