Canon EOS 4000D vs Canon EOS 40D: read noise comparison
Input-referred read noise at base ISO: Canon EOS 4000D 11.8 e⁻ (ISO 100), Canon EOS 40D 16.1 e⁻ (ISO 100).
Canon EOS 4000D
The Canon EOS 4000D was measured at 8 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 7.01 DN, or 11.8 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 24,095 electrons; unity gain is around ISO 170.
Canon EOS 40D
The Canon EOS 40D was measured at 14 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 5.62 DN, or 16.1 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 1600 don't change analog gain (digital push). Full well at base ISO is about 43,786 electrons; unity gain is around ISO 280.
Canon EOS 4000D vs Canon EOS 40D read noise table
| ISO | Canon EOS 4000D | Canon EOS 40D |
|---|---|---|
| 100 | 7.013 | 5.618 |
| 125 | – | 7.210 |
| 160 | – | 4.823 |
| 200 | 7.464 | 6.233 |
| 250 | – | 8.225 |
| 320 | – | 6.320 |
| 400 | 8.754 | 8.168 |
| 500 | – | 10.853 |
| 640 | – | 9.781 |
| 800 | 11.713 | 12.210 |
| 1000 | – | 15.780 |
| 1250 | – | 16.679 |
| 1600 | 18.252 | 21.556 |
| 3200 | 32.223 | 42.814 |
| 6400 | 64.000 | – |
| 12800 | 123.640 | – |
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