Olympus OM-D E-M5 Mark III vs Olympus PEN E-P7: read noise comparison

Input-referred read noise at base ISO: Olympus OM-D E-M5 Mark III 4.6 e⁻ (ISO 200), Olympus PEN E-P7 5.1 e⁻ (ISO 200).

Olympus OM-D E-M5 Mark III

The Olympus OM-D E-M5 Mark III was measured at 23 ISO settings from ISO 64 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.78 DN, or 4.6 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 22,517 electrons; unity gain is around ISO 1170.

Olympus PEN E-P7

The Olympus PEN E-P7 was measured at 23 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.82 DN, or 5.1 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 23,899 electrons; unity gain is around ISO 1250.

Olympus OM-D E-M5 Mark III vs Olympus PEN E-P7 read noise table

ISO	Olympus OM-D E-M5 Mark III	Olympus PEN E-P7
64	0.883	–
100	–	0.768
200	0.779	0.818
250	0.877	0.946
320	1.000	1.125
400	1.197	1.347
500	1.414	1.625
640	1.647	1.959
800	2.028	2.346
1000	2.395	2.848
1250	2.928	3.458
1600	3.555	4.257
2000	3.294	4.170
2500	3.891	5.028
3200	4.790	6.190
4000	5.696	7.674
5000	7.111	9.318
6400	8.938	11.551
8000	11.236	14.825
10000	14.320	18.765
12800	17.630	23.264
16000	22.785	29.243
20000	28.443	37.531
25600	35.753	46.527

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