TREN
Panasonic Lumix DMC-GH2 read noise vs ISO
The Panasonic Lumix DMC-GH2 was measured at 19 ISO settings from ISO 160 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (160) read noise is 1.95 DN, or 5.7 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 11,867 electrons; unity gain is around ISO 460.
Panasonic Lumix DMC-GH2 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 160 | 1.945 | 0.96 |
| 200 | 2.378 | 1.25 |
| 250 | 2.789 | 1.48 |
| 320 | 2.532 | 1.34 |
| 400 | 3.160 | 1.66 |
| 500 | 4.028 | 2.01 |
| 640 | 4.228 | 2.08 |
| 800 | 5.315 | 2.41 |
| 1000 | 7.727 | 2.95 |
| 1250 | 8.168 | 3.03 |
| 1600 | 9.918 | 3.31 |
| 2000 | 13.929 | 3.80 |
| 2500 | 17.268 | 4.11 |
| 3200 | 19.427 | 4.28 |
| 4000 | 28.246 | 4.82 |
| 5000 | 34.535 | 5.11 |
| 8000 | 49.522 | 5.63 |
| 10000 | 62.683 | 5.97 |
| 12800 | 77.172 | 6.27 |