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

Input-referred read noise at base ISO: Olympus OM-D E-M1 3.4 e⁻ (ISO 200), Olympus OM-D E-M1 Mark II (EFCS) 7 e⁻ (ISO 200).

Olympus OM-D E-M1

The Olympus OM-D E-M1 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 0.77 DN, or 3.4 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 16,735 electrons; unity gain is around ISO 870.

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

ISO	Olympus OM-D E-M1	Olympus OM-D E-M1 Mark II (EFCS)
64	–	0.853
100	0.818	0.768
200	0.774	0.841
250	0.847	0.717
320	0.933	0.779
400	1.042	0.920
500	1.149	1.028
640	1.301	1.266
800	1.558	1.505
1000	1.879	1.778
1250	2.204	2.158
1600	2.732	2.532
2000	3.411	2.346
2500	4.141	2.888
3200	5.098	3.387
4000	6.320	4.056
5000	7.464	5.028
6400	9.254	5.979
8000	11.472	7.568
10000	14.320	9.580
12800	18.252	12.210
16000	22.785	15.348
20000	29.243	19.160
25600	37.014	23.918

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