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Olympus OM-D E-M1 Mark III vs Olympus OM-D E-M10 Mark II: read noise comparison

Input-referred read noise at base ISO: Olympus OM-D E-M1 Mark III 4.1 e⁻ (ISO 200), Olympus OM-D E-M10 Mark II 6.3 e⁻ (ISO 200).

Olympus OM-D E-M1 Mark III

The Olympus OM-D E-M1 Mark III 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 4.1 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 21,320 electrons; unity gain is around ISO 1110.

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-M1 Mark III vs Olympus OM-D E-M10 Mark II read noise table

ISO	Olympus OM-D E-M1 Mark III	Olympus OM-D E-M10 Mark II
64	0.853	–
100	0.790	0.979
200	0.747	0.973
250	0.877	1.149
320	0.979	1.338
400	1.173	1.072
500	1.395	1.283
640	1.613	1.526
800	1.959	1.866
1000	2.329	2.282
1250	2.809	2.751
1600	3.434	3.411
2000	3.227	4.199
2500	3.837	5.134
3200	4.724	6.409
4000	5.856	8.056
5000	6.916	10.126
6400	8.815	13.086
8000	11.158	16.111
10000	13.929	20.252
12800	17.388	25.992
16000	22.009	32.447
20000	27.665	40.504
25600	35.506	50.914

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