TREN
Canon PowerShot G9 read noise vs ISO
The Canon PowerShot G9 was measured at 6 ISO settings from ISO 80 to ISO 1600. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (80) read noise is 4.47 DN. From ISO 80 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Canon PowerShot G9 read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 80 | 4.469 | 2.16 |
| 100 | 5.540 | 2.47 |
| 200 | 10.853 | 3.44 |
| 400 | 21.857 | 4.45 |
| 800 | 44.942 | 5.49 |
| 1600 | 86.823 | 6.44 |