Phase One IQ4 150MP vs Phase One P45+ 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 P45+DxO

The Phase One P45+ was measured at 5 ISO settings from ISO 64 to ISO 800. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (64) read noise is 18.13 DN. From ISO 64 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Phase One IQ4 150MP vs Phase One P45+ read noise table

ISO	Phase One IQ4 150MP	Phase One P45+
50	4.199	–
64	4.141	18.126
80	4.056	–
100	4.170	42.518
125	4.112	–
160	4.199	–
200	7.568	85.036
250	7.674	–
320	7.727	–
400	6.821	170.072
500	6.727	–
640	7.062	–
800	12.906	340.144
1000	13.642	–
1250	13.361	–
1600	25.813	–
2000	26.173	–
2500	25.634	–
3200	50.213	–
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 P45+: read noise comparison