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Olympus OM-D E-M1 Mark III vs Olympus OM-D E-M10: 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 6.9 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

The Olympus OM-D E-M10 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 1.15 DN, or 6.9 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 23,059 electrons; unity gain is around ISO 1200.

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

ISO	Olympus OM-D E-M1 Mark III	Olympus OM-D E-M10
64	0.853	–
100	0.790	1.266
200	0.747	1.149
250	0.877	1.347
320	0.979	1.602
400	1.173	1.292
500	1.395	1.526
640	1.613	1.828
800	1.959	2.219
1000	2.329	2.713
1250	2.809	3.294
1600	3.434	4.112
2000	3.227	5.098
2500	3.837	6.277
3200	4.724	7.890
4000	5.856	9.714
5000	6.916	12.126
6400	8.815	15.242
8000	11.158	19.160
10000	13.929	23.918
12800	17.388	30.065
16000	22.009	38.055
20000	27.665	47.177
25600	35.506	58.081

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