Olympus OM-D E-M10 Mark IV vs Olympus OM-D E-M5: read noise comparison

Input-referred read noise at base ISO: Olympus OM-D E-M10 Mark IV 3.9 e⁻ (ISO 200), Olympus OM-D E-M5 5.9 e⁻ (ISO 200).

Olympus OM-D E-M10 Mark IV

The Olympus OM-D E-M10 Mark IV 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 0.86 DN, or 3.9 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 17,603 electrons; unity gain is around ISO 920.

Olympus OM-D E-M5

The Olympus OM-D E-M5 was measured at 22 ISO settings from ISO 200 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.98 DN, or 5.9 electrons at the sensor. From ISO 640 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 3200 don't change analog gain (digital push). Full well at base ISO is about 23,204 electrons; unity gain is around ISO 1200.

Olympus OM-D E-M10 Mark IV vs Olympus OM-D E-M5 read noise table

ISO	Olympus OM-D E-M10 Mark IV	Olympus OM-D E-M5
100	0.807	–
200	0.865	0.979
250	1.000	1.149
320	1.181	1.385
400	1.414	1.094
500	1.705	1.301
640	2.056	1.548
800	2.479	1.879
1000	3.010	2.297
1250	3.605	2.848
1600	4.438	3.531
2000	4.317	4.377
2500	5.278	5.502
3200	6.364	6.821
4000	7.890	8.634
5000	9.580	10.853
6400	12.295	13.737
8000	15.562	17.268
10000	19.427	21.706
12800	24.761	27.665
16000	30.484	34.297
20000	39.124	43.713
25600	49.180	54.948

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