TREN
Canon EOS R8 read noise vs ISO
The Canon EOS R8 was measured at 33 ISO settings from ISO 50 to ISO 204800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 1.04 DN, or 6.1 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 102400 don't change analog gain (digital push). Full well at base ISO is about 92,859 electrons; unity gain is around ISO 590.
Canon EOS R8 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 50 | ▼ 1.042 | 0.06 |
| 100 | ▼ 1.035 | 0.05 |
| 125 | ▼ 1.454 | 0.54 |
| 160 | ▼ 2.042 | 1.03 |
| 200 | ▼ 1.505 | 0.59 |
| 250 | ▼ 2.071 | 1.05 |
| 320 | ▼ 2.868 | 1.52 |
| 400 | ▼ 1.257 | 0.33 |
| 500 | ▼ 1.778 | 0.83 |
| 640 | ▼ 2.479 | 1.31 |
| 800 | ▼ 2.099 | 1.07 |
| 1000 | ▼ 2.848 | 1.51 |
| 1250 | ▼ 3.837 | 1.94 |
| 1600 | 3.891 | 1.96 |
| 2000 | 5.028 | 2.33 |
| 2500 | 6.453 | 2.69 |
| 3200 | 7.210 | 2.85 |
| 4000 | 8.938 | 3.16 |
| 5000 | 11.314 | 3.50 |
| 6400 | 12.210 | 3.61 |
| 8000 | 15.562 | 3.96 |
| 10000 | 19.562 | 4.29 |
| 12800 | 24.251 | 4.60 |
| 16000 | 30.484 | 4.93 |
| 20000 | 38.319 | 5.26 |
| 25600 | 48.840 | 5.61 |
| 32000 | 59.714 | 5.90 |
| 40000 | 76.109 | 6.25 |
| 51200 | 96.336 | 6.59 |
| 64000 | 122.786 | 6.94 |
| 80000 | 152.219 | 7.25 |
| 102400 | 194.012 | 7.60 |
| 204800 | ▼ 282.088 | 8.14 |