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Phase One IQ4 150MP vs Phase One P65+: read noise comparison
Phase One IQ4 150MP
The Phase One IQ4 150MP was measured at 28 ISO settings from ISO 50 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 4.17 DN, or 3.5 electrons at the sensor. From ISO 20000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 54,029 electrons; unity gain is around ISO 80.
Phase One P65+DxO
The Phase One P65+ was measured at 6 ISO settings from ISO 100 to ISO 3200. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (100) read noise is 21.86 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.
Phase One IQ4 150MP vs Phase One P65+ read noise table
| ISO | Phase One IQ4 150MP | Phase One P65+ |
|---|---|---|
| 50 | 4.199 | – |
| 64 | 4.141 | – |
| 80 | 4.056 | – |
| 100 | 4.170 | 21.857 |
| 125 | 4.112 | – |
| 160 | 4.199 | – |
| 200 | 7.568 | 40.504 |
| 250 | 7.674 | – |
| 320 | 7.727 | – |
| 400 | 6.821 | 85.036 |
| 500 | 6.727 | – |
| 640 | 7.062 | – |
| 800 | 12.906 | 171.255 |
| 1000 | 13.642 | – |
| 1250 | 13.361 | – |
| 1600 | 25.813 | 372.217 |
| 2000 | 26.173 | – |
| 2500 | 25.634 | – |
| 3200 | 50.213 | 621.668 |
| 4000 | 49.867 | – |
| 5000 | 49.522 | – |
| 6400 | 95.670 | – |
| 8000 | 103.250 | – |
| 10000 | 97.006 | – |
| 12800 | 181.019 | – |
| 16000 | 177.294 | – |
| 20000 | 184.823 | – |
| 25600 | 372.217 | – |
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