Canon EOS 1D X Mark III (ES) vs Canon EOS 1Ds Mark II: read noise comparison
Input-referred read noise at base ISO: Canon EOS 1D X Mark III (ES) 22.2 e⁻ (ISO 100), Canon EOS 1Ds Mark II 25.6 e⁻ (ISO 100).
Canon EOS 1D X Mark III (ES)
The Canon EOS 1D X Mark III (ES) was measured at 35 ISO settings from ISO 50 to ISO 819200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 3.51 DN, or 22.2 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 102400 don't change analog gain (digital push). Full well at base ISO is about 100,477 electrons; unity gain is around ISO 630.
Canon EOS 1Ds Mark II
The Canon EOS 1Ds Mark II was measured at 15 ISO settings from ISO 50 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 2.00 DN, or 25.6 electrons at the sensor. From ISO 800 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 50,866 electrons; unity gain is around ISO 1280.
Canon EOS 1D X Mark III (ES) vs Canon EOS 1Ds Mark II read noise table
| ISO | Canon EOS 1D X Mark III (ES) | Canon EOS 1Ds Mark II |
|---|---|---|
| 50 | 3.482 | 1.741 |
| 100 | 3.506 | 2.000 |
| 125 | 4.627 | 2.329 |
| 160 | 3.918 | 2.789 |
| 200 | 3.891 | 2.099 |
| 250 | 5.063 | 2.532 |
| 320 | 4.199 | 3.031 |
| 400 | 4.257 | 2.462 |
| 500 | 5.502 | 2.949 |
| 640 | 7.062 | 3.580 |
| 800 | 4.891 | 3.340 |
| 1000 | 6.409 | 4.228 |
| 1250 | 8.056 | 5.169 |
| 1600 | 6.589 | 6.498 |
| 2000 | 8.456 | – |
| 2500 | 10.629 | – |
| 3200 | 9.987 | 12.641 |
| 4000 | 12.553 | – |
| 5000 | 15.780 | – |
| 6400 | 15.889 | – |
| 8000 | 19.698 | – |
| 10000 | 24.761 | – |
| 12800 | 30.484 | – |
| 16000 | 38.586 | – |
| 20000 | 48.168 | – |
| 25600 | 60.969 | – |
| 32000 | 76.109 | – |
| 40000 | 95.670 | – |
| 51200 | 121.095 | – |
| 64000 | 150.123 | – |
| 80000 | 191.341 | – |
| 102400 | 240.518 | – |
| 204800 | 340.144 | – |
| 409600 | 584.071 | – |
| 819200 | 1,120.557 | – |
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