TREN
Olympus OM-D E-M10 Mark IV read noise vs ISO
The Olympus OM-D E-M10 Mark IV was measured at 23 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (200) read noise is 0.86 DN, or 3.9 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 17,603 electrons; unity gain is around ISO 920.
Olympus OM-D E-M10 Mark IV read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | ○ 0.807 | -0.31 |
| 200 | 0.865 | -0.21 |
| 250 | 1.000 | 0.00 |
| 320 | 1.181 | 0.24 |
| 400 | 1.414 | 0.50 |
| 500 | 1.705 | 0.77 |
| 640 | 2.056 | 1.04 |
| 800 | 2.479 | 1.31 |
| 1000 | 3.010 | 1.59 |
| 1250 | 3.605 | 1.85 |
| 1600 | 4.438 | 2.15 |
| 2000 | 4.317 | 2.11 |
| 2500 | 5.278 | 2.40 |
| 3200 | 6.364 | 2.67 |
| 4000 | 7.890 | 2.98 |
| 5000 | 9.580 | 3.26 |
| 6400 | 12.295 | 3.62 |
| 8000 | 15.562 | 3.96 |
| 10000 | 19.427 | 4.28 |
| 12800 | 24.761 | 4.63 |
| 16000 | ○ 30.484 | 4.93 |
| 20000 | ○ 39.124 | 5.29 |
| 25600 | ○ 49.180 | 5.62 |