TREN
Canon EOS 800D read noise vs ISO
The Canon EOS 800D was measured at 10 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 2.36 DN, or 5.2 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 25600 don't change analog gain (digital push). Full well at base ISO is about 35,012 electrons; unity gain is around ISO 220.
Canon EOS 800D read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 100 | 2.362 | 1.24 |
| 200 | 3.458 | 1.79 |
| 400 | 6.635 | 2.73 |
| 800 | 11.551 | 3.53 |
| 1600 | 19.562 | 4.29 |
| 3200 | 35.753 | 5.16 |
| 6400 | 59.714 | 5.90 |
| 12800 | 119.428 | 6.90 |
| 25600 | 222.861 | 7.80 |
| 51200 | ○ 396.177 | 8.63 |