TREN
Panasonic Lumix DMC-GX7 read noise vs ISO
The Panasonic Lumix DMC-GX7 was measured at 24 ISO settings from ISO 125 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (125) read noise is 0.65 DN, or 3.4 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 20,947 electrons; unity gain is around ISO 670.
Panasonic Lumix DMC-GX7 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 125 | 0.646 | -0.63 |
| 160 | 0.753 | -0.41 |
| 200 | 0.790 | -0.34 |
| 250 | 0.835 | -0.26 |
| 320 | 0.966 | -0.05 |
| 400 | 1.141 | 0.19 |
| 500 | 1.376 | 0.46 |
| 640 | 1.625 | 0.70 |
| 800 | 1.879 | 0.91 |
| 1000 | 2.235 | 1.16 |
| 1250 | 2.809 | 1.49 |
| 1600 | 3.434 | 1.78 |
| 2000 | 4.257 | 2.09 |
| 2500 | 5.315 | 2.41 |
| 3200 | 6.277 | 2.65 |
| 4000 | 7.568 | 2.92 |
| 5000 | 9.190 | 3.20 |
| 6400 | 11.632 | 3.54 |
| 8000 | ○ 15.242 | 3.93 |
| 10000 | ○ 18.252 | 4.19 |
| 12800 | ○ 23.103 | 4.53 |
| 16000 | ○ 30.065 | 4.91 |
| 20000 | ○ 36.758 | 5.20 |
| 25600 | ○ 45.570 | 5.51 |