TREN
Canon EOS R7 (ES) read noise vs ISO
The Canon EOS R7 (ES) was measured at 27 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 4.26 DN, or 7.6 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 32000 don't change analog gain (digital push). Full well at base ISO is about 28,452 electrons; unity gain is around ISO 180.
Canon EOS R7 (ES) read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 4.257 | 2.09 |
| 125 | 5.540 | 2.47 |
| 160 | 7.160 | 2.84 |
| 200 | 5.063 | 2.34 |
| 250 | 6.543 | 2.71 |
| 320 | 8.515 | 3.09 |
| 400 | 5.502 | 2.46 |
| 500 | 7.062 | 2.82 |
| 640 | 9.254 | 3.21 |
| 800 | 8.168 | 3.03 |
| 1000 | 10.411 | 3.38 |
| 1250 | 13.269 | 3.73 |
| 1600 | 12.906 | 3.69 |
| 2000 | 16.564 | 4.05 |
| 2500 | 21.112 | 4.40 |
| 3200 | 21.112 | 4.40 |
| 4000 | 26.723 | 4.74 |
| 5000 | 33.591 | 5.07 |
| 6400 | 36.504 | 5.19 |
| 8000 | 45.887 | 5.52 |
| 10000 | 56.886 | 5.83 |
| 12800 | 70.035 | 6.13 |
| 16000 | 89.264 | 6.48 |
| 20000 | 108.383 | 6.76 |
| 25600 | 135.298 | 7.08 |
| 32000 | 164.279 | 7.36 |
| 51200 | ○ 240.518 | 7.91 |