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Olympus OM-D E-M10 Mark II vs Olympus OM-D E-M1X: read noise comparison

Input-referred read noise at base ISO: Olympus OM-D E-M10 Mark II 6.3 e⁻ (ISO 200), Olympus OM-D E-M1X 3.9 e⁻ (ISO 200).

Olympus OM-D E-M10 Mark II

The Olympus OM-D E-M10 Mark II 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 0.97 DN, or 6.3 electrons at the sensor. From ISO 800 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 24,773 electrons; unity gain is around ISO 1290.

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 II vs Olympus OM-D E-M1X read noise table

ISO	Olympus OM-D E-M10 Mark II	Olympus OM-D E-M1X
64	–	0.889
100	0.979	0.841
200	0.973	0.753
250	1.149	0.895
320	1.338	0.993
400	1.072	1.197
500	1.283	1.444
640	1.526	1.729
800	1.866	2.071
1000	2.282	2.395
1250	2.751	3.031
1600	3.411	3.605
2000	4.199	3.387
2500	5.134	4.084
3200	6.409	4.790
4000	8.056	5.897
5000	10.126	7.160
6400	13.086	9.318
8000	16.111	11.632
10000	20.252	14.929
12800	25.992	18.379
16000	32.447	23.588
20000	40.504	30.274
25600	50.914	37.014

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