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Phase One P40+ vs Phase One P65+: read noise comparison

Phase One P40+DxO

The Phase One P40+ 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 17.03 DN. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

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 P40+ vs Phase One P65+ read noise table

ISOPhase One P40+Phase One P65+
10017.03021.857
20030.91040.504
40062.68385.036
800127.116171.255
1600315.173372.217
3200596.344621.668

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Data: Photons to Photos · © William J. Claff