TREN
Olympus PEN E-P7 read noise vs ISO
The Olympus PEN E-P7 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 0.82 DN, or 5.1 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 23,899 electrons; unity gain is around ISO 1250.
Olympus PEN E-P7 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | ○ 0.768 | -0.38 |
| 200 | 0.818 | -0.29 |
| 250 | 0.946 | -0.08 |
| 320 | 1.125 | 0.17 |
| 400 | 1.347 | 0.43 |
| 500 | 1.625 | 0.70 |
| 640 | 1.959 | 0.97 |
| 800 | 2.346 | 1.23 |
| 1000 | 2.848 | 1.51 |
| 1250 | 3.458 | 1.79 |
| 1600 | 4.257 | 2.09 |
| 2000 | 4.170 | 2.06 |
| 2500 | 5.028 | 2.33 |
| 3200 | 6.190 | 2.63 |
| 4000 | 7.674 | 2.94 |
| 5000 | 9.318 | 3.22 |
| 6400 | 11.551 | 3.53 |
| 8000 | 14.825 | 3.89 |
| 10000 | 18.765 | 4.23 |
| 12800 | 23.264 | 4.54 |
| 16000 | 29.243 | 4.87 |
| 20000 | 37.531 | 5.23 |
| 25600 | 46.527 | 5.54 |