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Olympus OM-D E-M1 Mark II (EFCS) vs Olympus OM-D E-M1 Mark III: read noise comparison

Input-referred read noise at base ISO: Olympus OM-D E-M1 Mark II (EFCS) 7 e⁻ (ISO 200), Olympus OM-D E-M1 Mark III 4.1 e⁻ (ISO 200).

Olympus OM-D E-M1 Mark II (EFCS)

The Olympus OM-D E-M1 Mark II (EFCS) 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 0.84 DN, or 7 electrons at the sensor. From ISO 3200 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 31,813 electrons; unity gain is around ISO 1660.

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-M1 Mark II (EFCS) vs Olympus OM-D E-M1 Mark III read noise table

ISO	Olympus OM-D E-M1 Mark II (EFCS)	Olympus OM-D E-M1 Mark III
64	0.853	0.853
100	0.768	0.790
200	0.841	0.747
250	0.717	0.877
320	0.779	0.979
400	0.920	1.173
500	1.028	1.395
640	1.266	1.613
800	1.505	1.959
1000	1.778	2.329
1250	2.158	2.809
1600	2.532	3.434
2000	2.346	3.227
2500	2.888	3.837
3200	3.387	4.724
4000	4.056	5.856
5000	5.028	6.916
6400	5.979	8.815
8000	7.568	11.158
10000	9.580	13.929
12800	12.210	17.388
16000	15.348	22.009
20000	19.160	27.665
25600	23.918	35.506

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