Phase One IQ4 150MP vs Phase One P40+ 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 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 IQ4 150MP vs Phase One P40+ read noise table

ISO	Phase One IQ4 150MP	Phase One P40+
50	4.199	–
64	4.141	–
80	4.056	–
100	4.170	17.030
125	4.112	–
160	4.199	–
200	7.568	30.910
250	7.674	–
320	7.727	–
400	6.821	62.683
500	6.727	–
640	7.062	–
800	12.906	127.116
1000	13.642	–
1250	13.361	–
1600	25.813	315.173
2000	26.173	–
2500	25.634	–
3200	50.213	596.344
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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Phase One IQ4 150MP vs Phase One P40+: read noise comparison