TREN
Olympus OM-D E-M10 read noise vs ISO
The Olympus OM-D E-M10 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 1.15 DN, or 6.9 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 12800 don't change analog gain (digital push). Full well at base ISO is about 23,059 electrons; unity gain is around ISO 1200.
Olympus OM-D E-M10 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | ○ 1.266 | 0.34 |
| 200 | 1.149 | 0.20 |
| 250 | 1.347 | 0.43 |
| 320 | 1.602 | 0.68 |
| 400 | 1.292 | 0.37 |
| 500 | 1.526 | 0.61 |
| 640 | 1.828 | 0.87 |
| 800 | 2.219 | 1.15 |
| 1000 | 2.713 | 1.44 |
| 1250 | 3.294 | 1.72 |
| 1600 | 4.112 | 2.04 |
| 2000 | 5.098 | 2.35 |
| 2500 | 6.277 | 2.65 |
| 3200 | 7.890 | 2.98 |
| 4000 | 9.714 | 3.28 |
| 5000 | 12.126 | 3.60 |
| 6400 | 15.242 | 3.93 |
| 8000 | 19.160 | 4.26 |
| 10000 | 23.918 | 4.58 |
| 12800 | 30.065 | 4.91 |
| 16000 | ▲ 38.055 | 5.25 |
| 20000 | ▲ 47.177 | 5.56 |
| 25600 | ▲ 58.081 | 5.86 |