TREN
Panasonic Lumix DMC-GH4 read noise vs ISO
The Panasonic Lumix DMC-GH4 was measured at 25 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 0.80 DN, or 3.9 electrons at the sensor. From ISO 640 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 19,459 electrons; unity gain is around ISO 980.
Panasonic Lumix DMC-GH4 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | ○ 0.753 | -0.41 |
| 125 | ○ 0.871 | -0.20 |
| 160 | ○ 1.007 | 0.01 |
| 200 | 0.801 | -0.32 |
| 250 | 0.933 | -0.10 |
| 320 | 1.087 | 0.12 |
| 400 | 1.301 | 0.38 |
| 500 | 1.548 | 0.63 |
| 640 | 1.879 | 0.91 |
| 800 | 2.282 | 1.19 |
| 1000 | 2.789 | 1.48 |
| 1250 | 3.482 | 1.80 |
| 1600 | 4.228 | 2.08 |
| 2000 | 5.278 | 2.40 |
| 2500 | 6.543 | 2.71 |
| 3200 | 8.056 | 3.01 |
| 4000 | 10.267 | 3.36 |
| 5000 | 12.906 | 3.69 |
| 6400 | 16.223 | 4.02 |
| 8000 | 20.393 | 4.35 |
| 10000 | 25.634 | 4.68 |
| 12800 | 32.447 | 5.02 |
| 16000 | ○ 20.535 | 4.36 |
| 20000 | ○ 25.813 | 4.69 |
| 25600 | ○ 32.900 | 5.04 |