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Olympus OM-D E-M10 Mark IV vs Olympus OM-D E-M1X: 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-M1X 3.9 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-M1X

The Olympus OM-D E-M1X was measured at 24 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 0.75 DN, or 3.9 electrons at the sensor. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 19,749 electrons; unity gain is around ISO 1030.

Olympus OM-D E-M10 Mark IV vs Olympus OM-D E-M1X read noise table

ISO	Olympus OM-D E-M10 Mark IV	Olympus OM-D E-M1X
64	–	0.889
100	0.807	0.841
200	0.865	0.753
250	1.000	0.895
320	1.181	0.993
400	1.414	1.197
500	1.705	1.444
640	2.056	1.729
800	2.479	2.071
1000	3.010	2.395
1250	3.605	3.031
1600	4.438	3.605
2000	4.317	3.387
2500	5.278	4.084
3200	6.364	4.790
4000	7.890	5.897
5000	9.580	7.160
6400	12.295	9.318
8000	15.562	11.632
10000	19.427	14.929
12800	24.761	18.379
16000	30.484	23.588
20000	39.124	30.274
25600	49.180	37.014

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