TREN
Canon PowerShot G3 X read noise vs ISO
The Canon PowerShot G3 X was measured at 8 ISO settings from ISO 125 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (125) read noise is 4.69 DN. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Canon PowerShot G3 X read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 125 | 4.691 | 2.23 |
| 200 | 6.409 | 2.68 |
| 400 | 11.158 | 3.48 |
| 800 | 19.973 | 4.32 |
| 1600 | 36.252 | 5.18 |
| 3200 | 65.799 | 6.04 |
| 6400 | 127.116 | 6.99 |
| 12800 | 265.028 | 8.05 |