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Canon PowerShot G7 X vs Canon PowerShot G9: read noise comparison
Canon PowerShot G7 X
The Canon PowerShot G7 X was measured at 21 ISO settings from ISO 125 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (125) read noise is 0.93 DN, or 2.6 electrons at the sensor. From ISO 1000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 10,203 electrons; unity gain is around ISO 360.
Canon PowerShot G9DxO
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 G7 X vs Canon PowerShot G9 read noise table
| ISO | Canon PowerShot G7 X | Canon PowerShot G9 |
|---|---|---|
| 80 | – | 4.469 |
| 100 | – | 5.540 |
| 125 | 0.927 | – |
| 160 | 1.094 | – |
| 200 | 1.275 | 10.853 |
| 250 | 1.548 | – |
| 320 | 1.840 | – |
| 400 | 2.204 | 21.857 |
| 500 | 2.621 | – |
| 640 | 3.227 | – |
| 800 | 3.837 | 44.942 |
| 1000 | 4.563 | – |
| 1250 | 5.540 | – |
| 1600 | 6.774 | 86.823 |
| 2000 | 8.282 | – |
| 2500 | 10.126 | – |
| 3200 | 12.996 | – |
| 4000 | 16.223 | – |
| 5000 | 20.393 | – |
| 6400 | 25.992 | – |
| 8000 | 32.223 | – |
| 10000 | 39.947 | – |
| 12800 | 51.268 | – |
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