TREN
Canon EOS 70D read noise vs ISO
The Canon EOS 70D was measured at 22 ISO settings from ISO 100 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 6.50 DN, or 12.7 electrons at the sensor. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 28,067 electrons; unity gain is around ISO 200.
Canon EOS 70D read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 6.498 | 2.70 |
| 125 | 8.225 | 3.04 |
| 160 | 5.579 | 2.48 |
| 200 | 7.062 | 2.82 |
| 250 | 8.815 | 3.14 |
| 320 | 6.821 | 2.77 |
| 400 | 8.515 | 3.09 |
| 500 | 10.556 | 3.40 |
| 640 | 9.190 | 3.20 |
| 800 | 11.959 | 3.58 |
| 1000 | 15.032 | 3.91 |
| 1250 | 15.242 | 3.93 |
| 1600 | 19.027 | 4.25 |
| 2000 | 23.588 | 4.56 |
| 2500 | 23.918 | 4.58 |
| 3200 | 29.857 | 4.90 |
| 4000 | 37.271 | 5.22 |
| 5000 | 42.814 | 5.42 |
| 6400 | 53.446 | 5.74 |
| 8000 | 65.345 | 6.03 |
| 10000 | 86.823 | 6.44 |
| 12800 | 103.250 | 6.69 |