TREN
Canon EOS M6 Mark II read noise vs ISO
The Canon EOS M6 Mark II 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 (100) read noise is 3.29 DN, or 6.1 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 29,216 electrons; unity gain is around ISO 180.
Canon EOS M6 Mark II read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 3.294 | 1.72 |
| 125 | 4.228 | 2.08 |
| 160 | 3.182 | 1.67 |
| 200 | 3.918 | 1.97 |
| 250 | 5.134 | 2.36 |
| 320 | 3.732 | 1.90 |
| 400 | 4.659 | 2.22 |
| 500 | 6.021 | 2.59 |
| 640 | 6.869 | 2.78 |
| 800 | 8.634 | 3.11 |
| 1000 | 11.158 | 3.48 |
| 1250 | 11.004 | 3.46 |
| 1600 | 13.929 | 3.80 |
| 2000 | 18.001 | 4.17 |
| 2500 | 18.896 | 4.24 |
| 3200 | 23.588 | 4.56 |
| 4000 | 29.041 | 4.86 |
| 5000 | 31.341 | 4.97 |
| 6400 | 39.947 | 5.32 |
| 8000 | 49.180 | 5.62 |
| 10000 | 61.820 | 5.95 |
| 12800 | 78.249 | 6.29 |
| 16000 | 98.360 | 6.62 |
| 20000 | 122.786 | 6.94 |
| 25600 | 153.277 | 7.26 |